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How to Setup a $340 Saltwater Aquarium
-Budget Build Guide

Updated September 2020

By Maxim B.

This $340 Saltwater Aquarium Budget Build guide is all about showing you how to setup up a good looking saltwater aquarium without spending a ton of money! This how to build guide focuses both on the aquarium aesthetics and the quality of gear, as well as the best prices. Finally, this how to budget build is built to be as close to plug-and-play as possible, so that it will be easy for you to setup and maintain your cheap budget saltwater aquarium.

Waterbox 10 saltwater aquarium, shows saltwater aquarium example instagram,
This is a wonderful example of the Waterbox Cube 10 from @betos_nano_reef on Instagram!

Table of Contents

(click on a topic to head directly to that section)

We ordered the list in importance and in which order we believe it is best to buy gear.

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Budget Build Stats:

Size: 10.9 Gallon (41.3 Liters)

Approximate Price: $340 

(Total with all optional items: $650)

Dimensions: 13.8 x 14.2 x 13.8 inch (35 x 36.1 x 35 cm)

Care Level: Easy

Style: Cube

Placement: Office, kitchen, living room, bedroom


The first and most defining piece of gear in your saltwater aquarium build is the aquarium itself. The aquarium’s size, shape, and filtration system will be what decides what you keep inside your aquarium. As well, it decides what other gear you should get!

For this saltwater aquarium build, we decided to go with the 10.9 gallon “Cube 10 Ultraclear” from Waterbox Aquariums, as it big enough to support a variety of corals, fish, and invertebrates. However, it is not so big that you need to spend a ton of money on extra gear, spend a lot of time maintaining it, and you do not even need to buy a dedicated stand for it. An aquarium this size could fit on a strong desk, table, or even kitchen counter! 

The aquarium being a cube will let you create an aquascape (AKA, rock structure) with depth that makes the aquarium look bigger than it is. As an added bonus, this aquarium is made of extremely clear “Starphire Glass” which has better visibility than normal glass. If you want to learn more about aquascaping, check out this article by Reefbum. The rock structure of your saltwater aquarium is very important as it is where you will attach your corals, and it is key to the looks of your aquarium. 

Finally, once you buy and receive the tank, make sure to put it somewhere flat and waterproof (outdoors, balcony, flat bathtub, etc.) and fill it up with tap water. During shipping of aquariums, there is always a chance they will be damaged and you might not even see it. Let the aquarium sit somewhere safe for about 24 hours filled with water, and if it is damaged or leaking, get a replacement! 

Cube 10 Saltwater Aquarium 10.9 gallons
WaterBox Cube 10 UltraClear 10.9 gallon Aquarium


The second thing every saltwater aquarium needs is a source of light! Without it, you wont be able to grow anything in your tank, however if you are interested in keeping fish alone, something called a FOWLR (Fish Only With Live Rock) then, you do not technically need a light. Still, we found a cheap but effective light that fits on the small aquarium and will be able to keep your beginner corals happy!

We suggest getting the cheap, sleek, and easy to use LED light in the Wave Point HO LED for this saltwater aquarium budget build. It is the perfect light for a beginner or someone looking for an inexpensive option that still provides usable light to corals.

You will not need to mess with any light settings, at most you might want to add a mechanical timer so that you do not need to turn it on and off every day. A consistent light schedule also helps the animals in your saltwater aquarium stay happy and healthy! 

Saltwater Aquarium Light
Saltwater Aquarium Light Wave-Point-Blade-HO-LED-Aquarium-Light-Super-Blue-10k

Filtration and Filter Media

Saltwater aquarium filtration can be the most complicated and confusing part of the aquarium hobby. How to filter an aquarium and what filter media to use is usually the last thing we fully understand as hobbyists. However, an experienced hobbyist will tell you that filtration really can be easy and simple.

And so, without getting scientific, there are three types of filtration that work together to complete the total filtration of your saltwater aquarium. These types of filtration are:

  • Mechanical filtration
  • Biological filtration
  • Chemical filtration

I HIGHLY suggest that you watch the following video for an in-depth explanation on how filtration works, as it would require a whole separate article for me to explain it here. 

But, there is good news! This saltwater aquarium already comes with a starter kit of filter media, and has a built in filtration compartment that is nicely tucked into the aquarium.

These kinds of aquariums are called AIO (all-in-one) as the filtration compartment is within the aquarium itself, so you do not need to buy any extra filters! As well, if/when you add gear (such as a heater) you can hide it within this compartment so that it does not clutter up the display portion of your saltwater aquarium! 

If you decide that you want to get the highest quality filter media instead of the things that come with the aquarium, we have listed what we think are the best options for the three types of filtration! Also, you will need a filter media bag to put it in, you can buy that here.

Prefilter Pad for mechanical aquarium filtration
LifeGard Prefilter Replaceable Pad for mechanical filtration
AquaForest Life Bio Fil Aquarium Biological media
AquaForest Life Bio Fil Aquarium Biological media for filtration
Chemi-Pure Blue chemical filtration in nano packets for saltwater aquarium
Chemi-Pure Blue nano 5-pack for chemical filtration of aquarium

Gravel Vacuum / Siphon

There is another part to aquarium filtration that does not include filters and filtration media, and that is literally changing the water in your tank! Water changes are as simple as removing some saltwater and adding fresh saltwater to your aquarium. During this process, you can also use the siphon to “vacuum” by sucking up any detritus, which consists of fish waste, leftover food, or other nastiness in your saltwater aquarium. 

For this saltwater aquarium, I suggest buying the 5″ medium size.  If you get the mini it will drain water too slowly while the large will drain the tank too quickly! This piece of equipment is pretty universal, cheap budget build or expensive build, the only thing that changes is the size. 

Gravel Vacuum
Aqueon Gravel Vacuum/Siphon for aquarium cleaning


Heating your saltwater aquarium is a truly simple task. There are a few types of heaters, but generally, you just want a heater that is reliable and heats to the temperature you need. As was mentioned before, you saltwater aquarium prefers stability to be happy, so you should not have to mess around with your heaters often.

Most saltwater aquariums house tropical organisms that need a stable temperature between 77-82 degrees Fahrenheit. Unless your house is constantly in that temperature range, you will need a heater to keep you aquarium inhabitants healthy and happy. In the case you do live in a really hot climate, you may need to get a fan to actually cool your aquarium instead! 

Based on personal experience, reputation, and cost we recommend the Eheim Jager TruTemp 50 Watt aquarium heater. It is a favorite of many saltwater aquarium hobbyists, and has always remained affordable!

The thing about aquarium heaters is that they all fail eventually, so keep that in mind. It would be a good idea to eventually have two heaters, with the second being a spare for emergencies. The one thing all saltwater aquarium hobbyists realize, is that it always good to have back up gear!

Aquarium Heater Eheim Jager
Aquarium Heater Eheim-Jager-TruTemp-50-Watt-Fully-Submersible-UL-Approved-Heater


The thermometers are very important in a saltwater aquarium, because you need to confirm that your heater keeping your aquarium at the temperature you chose! It is normal for heaters to not be properly calibrated upon delivery, so you need to have a thermometer to re-calibrate and make sure you have the correct temperature. 

We have owned about 10 of these thermometers in the past several years, and they work well for how inexpensive they are. Crucial equipment in even the cheapest of budget builds. We tested three of these at a time in the same tank, and they were off by no more than 1.5 degrees Fahrenheit!

This is a 2-pack because we found it is never a bad idea to have an extra thermometer on hand! If you are mixing your own saltwater, you will need an extra thermometer to make sure the temperatures are consistent. 

two small waterproof digital aquarium thermometers on white background
Digital Thermometer Two Pack


A hydrometer is a tool that saltwater aquarium hobbyists use to measure how “salty” the water in their aquarium is. It is worth noting that hydrometers have fallen in popularity because for a reasonable price you can purchase a refractometer, which gives much more accurate readings. 

However, in the spirit of a cheap budget build, this hydrometer will measure the specific gravity (salinity) of your water accurately enough for now!

plastic saltwater aquarium hydrometer in original packaging
fluval Sea Hydrometer

Water Test Kit

A basic test kit is a must have tool for a saltwater aquarium hobbyist. It is most useful at the start of your aquarium, so you can test for when the nitrogen cycle is complete. 

This test kit is not the best available, but it is affordable and will give a ballpark reading, which will be good enough for most hobbyists. You can also use this to keep track of your aquarium’s health and to find out the cause of some issues before they manifest in the aquarium itself as algae or bacteria blooms. 

front view of api saltwater test kit in original packaging


Rock is very important in any saltwater aquarium as it provides: 

  • A place for beneficial bacteria to live
  • Hiding spots for your aquarium inhabitants
  • A place to attach coral.

To understand the importance of rock in a saltwater aquarium, watch this video. There are many types of rock, but this rock is cheap, looks great, and is perfect for a cheap saltwater aquarium budget build. 

pile of dried out porous rock made from dead coral skeletons
AquaMaxx Live Rock

Algae Scraper

An algae scraper is a simple and self-explanatory piece of equipment. Even with a perfect maintenance routine for your saltwater aquarium, algae will grow on your aquarium glass. The cheap scraper is the easiest way to remove the algae without getting your arms wet and messy! As well, when you siphon out the algae you scrape off, you are aiding the filtration of your saltwater aquarium.

We went for the common hand-held option in this saltwater budget build, but you may eventually want to also get the Flipper magnetic algae scraper to make your life even easier!

Algae Scraper Flipper Nano Budget Build
Flipper Hand held nano algae scraper for glass and acrylic

Fish Net

Every saltwater aquarium hobbyist needs a net, and they cost almost nothing! A net is just one of those tools that you always want to have.

Along with being good for catching and transferring fish, you can also use it when thawing frozen food to help get rid of any fillers or phosphates!

black fish net with long handle on white background
Fish Net

Optional Items

Temperature Controller

We previously established how important a stable temperature for your saltwater aquarium is. We also know that heating equipment can sometimes fail, no matter how reliable it is, and this type of failure can cause the complete crash of your saltwater aquarium. For just $35 you can control your aquarium’s temperature to within 0.1° F. This device just monitors your aquarium temperature, and makes sure that your heater does not get stuck in the “on” position, boiling your saltwater.

It actually has the ability to make sure you aquarium gets cooled too! I live in the desert, so in the summer I run a fan to keep my aquarium cool. I plug my fan into the “cooling” outlet and my heater into the “heating” outlet, and my tank stays a constant 78° F all year round.  Plus, this controller has a built in alarm which alerts me if my heater or fan ever fail. Quite amazing for a $35 device and it still fits within the cheap budget build!

black and grey temperature controller with probe sitting on white surface
Bayite 10 Amp Temperature Controller


Sand is not essential by any means. There is even a trend in the saltwater aquarium hobby being a bare bottom tank. That being said, sand completes a genuine aesthetic to make your aquarium really feel like its a slice of the Ocean. As well, sand aids in biological filtration while providing a refuge and food source for certain creatures. This video is good to watch if you want to learn more before you make a decision!

You only need a 10 lb bag for this aquarium. There are many types of sand to choose from but we would stick with the CaribSea brand.

wet live sand for saltwater aquariums
Fiji pink sand in 20 lb bag with close up of grain size
hawaiian black sand in 20 lb bag with close up of grain size

RO/DI Water Filter

The RO/DI filter is a water filtration unit that takes your tap water and purifies it to be as close to pure water as possible. It stands for Reverse Osmosis Deionization, and if you would like to understand how it works, read this article

You might hear from hobbyists online that an RO/DI filter is a must for any saltwater aquarium, but that just is not true. It does have benefits, and is mathematically cheaper in the long run. But, for small and beginner saltwater aquariums, there are other options that can be easier and simpler.

Firstly you could just go to your local fish store and buy pre-made saltwater and purified water. As well, you could get tap water conditioner and use tap water, but this is the most risky option and makes it more likely that you may run into problems with your saltwater.  

If you want to go ahead and take the plunge, there is a small and cheap option available, which will work perfectly for this cheap budget build and small saltwater aquarium. 

RODI filter from Aquatic Life with 4 cylinders for saltwater aquariums
AquaticLife RO Buddie Four Stage RODI system with DI included


As was mentioned earlier, any saltwater aquarium hobbyist would benefit from this refractometer. This is because a refractometer is way more accurate than a hydrometer. Even if you are committed to the cheap budget build, this tool will likely be a good investment.

Keeping your saltwater salinity at a stable and constant level is important when keeping corals, shrimps, and any other invertebrates. This is because invertebrates are much more sensitive to changes in water parameters!

It is worth noting that a refractometer does need to be calibrated. But, rather than buying an entire bottle of calibration fluid, just go to your LFS (Local Fish Store) and ask to use a few drops of theirs!

new refractometer out of package sitting on white background

Salt Mix

Most saltwater aquarium hobbyists start out by buying saltwater at our LFS (local fish store), because purchasing distilled water from the grocery store is expensive, and setting up the necessary RO/DI filter can be complicated

But, you can save a bit of money and hassle in the long run by mixing your saltwater at home. There are so many different types of salt mix on the market, and I’ve tried a ton of them!  They all work fine, but they vary depending on what you plan to keep inside your saltwater aquarium.

For this aquarium budget build we recommend this salt mix, as it is good for FOWLR (Fish Only With Live Rock) systems, or aquariums with low-demanding corals.

two red sea salt mix buckets side to side new in packaging

Calcium / Alkalinity Test Kit

If you are only planning on keeping fish or soft corals in your saltwater aquarium, then you don’t need to worry about things like calcium and alkalinity. This is because you water changes alone will likely provide all the proper nutrients and parameters that these corals need. 

But, SPS (small polyp stony) and LPS (large polyp stony) corals, need enough calcium and alkalinity to build their skeletons. This kit will let you know the ballpark values of these parameters in your saltwater. Thus, you know when you might need to dose extra or when you may have been over-dosing. This is very important, as your aquarium will suffer without proper parameters, even if you are doing everything else correctly.  

Reef Tank test kit new in packaging on white background

Power Strips

This is a piece of gear that you potentially already own, but if you have not realized it already, you will need a power strip to accommodate all the gear of your saltwater aquarium. This is not somewhere you want to be cheap, as the dangers of electrical accidents or fires should not be taken lightly. At best, your gear will turn off and your animals may get harmed. At worst, your gear will be destroyed and a fire might start!

We suggest getting this surge protector/power strip because it also has the ability to turn off individual pieces of gear without having to unplug them. This is very useful for saltwater changes, when it is recommended to turn off the heater so it does not get exposed to air while on and damaged.

7 outlet controllable surge protector and power strip
Tripp Lite 7 Outlet (controllable) surgeprotector powerstrip

Magnetic Algae Scraper

This is one item in the cheap budget build that is not a budget item! While there are cheaper magnetic algae scrapers, none of them even come close to what the Flipper offers. I’ve owned the same one for several years and it still works great!  You can also alternate the stainless steel blade and the soft felt side without getting your hands wet, which is a benefit to any saltwater aquarium hobbyist.

Flipper nano Algae Scraper out of packaging on white background
Flipper Nano 2-in-1 Magnetic Algae Scraper for Aquarium Glass or Acrylic


This is the end of how to build a $340 saltwater aquarium budget build guide! We provided you all the necessary items in order of importance, and even some optional items that would improve your saltwater hobby experience. We hope that you found this article helpful and informative, and if you decide to buy anything, please use our provided links! This costs you nothing extra, but helps us keep working, supporting you, and making great content. Feel free to look around the website or YouTube channel  if you have any questions about the hobby!

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