Your First Saltwater Aquarium, Week by Week
Start with an empty HelloReef aquarium and follow along week by week. We will build the tank, add saltwater, cycle it, choose a cleanup crew, add clownfish, and then decide whether the aquarium is truly ready for a bubble-tip anemone.
This free guide gives you the big picture. When you purchase the eligible HelloReef kit, you also get the complete course with more than 50 detailed videos that show you the process step by step.
What you will get from this free guide
This page shows you what to work on each week and how to tell when you are ready to move forward. Every weekly guide stands on its own, so you can see what to prepare, what to check, and where to go when you need more help.
This is not a replacement for the complete HelloReef course. The eligible kit includes more than 50 detailed videos that show the exact equipment, demonstrations, and full step-by-step setup.
Affiliate disclosure: My First Fish Tank may earn a commission from a qualifying purchase at no additional cost to you.
Your HelloReef aquarium, week by week
Start with Week 1 and work through the guides in order. If the tank is not ready for the next step, stay where you are and fix the problem first. The calendar is a guide; your aquarium gets the final say.
Build the aquarium before you add water
Choose a safe place for the tank, learn what the main pieces of equipment do, inspect the kit, put everything together dry, and build rockwork that is stable and easy to clean around.
- Location, support, access, and safer power routing
- Equipment roles and unboxing checks
- Stable rock, sand, flow clearance, and cleaning space
Add saltwater and turn on the equipment
Use the right source water, mix and measure the saltwater, set the temperature and flow, keep the electrical connections safe, and choose a simple lighting schedule.
- RO/DI or appropriate purified source water
- Salinity measurement and controlled adjustments
- Temperature, circulation, lighting, and electrical safety
Cycle the tank and practice the routine
Cycle the aquarium without a fish. While you wait, practice topping off evaporation, making replacement saltwater, recognizing normal early changes, and doing the basic jobs you will repeat after animals arrive.
- Use your test results—not a countdown—to decide when the cycle is complete
- Freshwater top-off and stored replacement seawater
- Diatoms, mechanical filtration, cleaning, and observation
Add a cleanup crew only when there is a job to do
Look at what is actually growing in the tank, then choose a small cleanup crew for that specific job. Buy healthy animals from a good seller, acclimate them carefully, and do not add a giant package of snails to a brand-new tank with nothing for them to eat.
- Choose animals for a specific job instead of buying a generic package
- Seller, compatibility, arrival, and acclimation decisions
- Observation-based feeding without nutrient overload
Choose and add your first clownfish
Choose a healthy captive-bred clownfish or pair, learn what healthy behavior looks like, plan how you will bring them home, feed without dumping extra waste into the tank, and keep up with the routine you practiced during the cycle.
- Species, number, size, behavior, and health criteria
- Arrival, acclimation, disease, and observation planning
- Feeding, top-off, cleaning, filtration, and water changes
Decide whether the tank is ready for an anemone—or whether you should wait
Look at the tank’s recent stability, your test results, lighting, fish health, and how consistent you have been with maintenance. Then decide whether it is time to add a healthy captive-propagated bubble-tip anemone or wait longer.
- Six weeks does not automatically mean the aquarium is ready
- Healthy-animal, transfer, light-acclimation, and powerhead safety
- Conservative feeding and realistic hosting expectations
How the free guide and complete course fit together
The free six-week series
- Explains what you are trying to accomplish each week and why it matters
- Shows you what to prepare and what to check before moving on
- Helps prevent common beginner mistakes
- Connects you to the right public guides and resources
- Remains useful even if you do not purchase the kit
The complete HelloReef course
- Includes more than 50 detailed videos with the kit
- Shows the exact equipment and complete process
- Provides step-by-step demonstrations
- Includes the complete challenge and bonus-learning experience
- Offers the deepest guidance for this exact aquarium path
Clownfish do not need an anemone
A healthy clownfish can live successfully without an anemone, and a clownfish should never be physically forced into contact with one. If hosting happens, allow it to develop naturally.
A few important questions
Can I finish the course faster than six weeks?
You might finish the physical setup quickly, but you cannot rush the biology. Move forward when your test results and the aquarium tell you it is ready—not simply because another week has passed.
Do I have to add an anemone in Week 6?
No. Week 6 is when you ask whether the tank is ready; it is not a deadline to buy an anemone. Waiting several more weeks or months may be the right answer, and your clownfish do not need an anemone.
Will the free guides contain the entire HelloReef course?
No. The free guides will give you a useful overview, preparation lists, and clear checks along the way. The complete course included with the eligible kit contains the detailed demonstrations, exact equipment process, and more than 50 videos.
Can I begin with a later week?
If this is a brand-new aquarium, start with Week 1 because every week builds on the one before it. If your tank is already running, start with the earliest week you can honestly say is complete. Do not skip ahead just because the aquarium has been wet for a certain number of days.
Want the complete HelloReef experience?
The free six-week series will help you understand the setup from beginning to end. When you purchase the eligible HelloReef kit, you get the aquarium system plus the complete course with more than 50 detailed setup and care videos.
Affiliate link. Availability, package contents, and pricing should be verified at the retailer before publication.
The next habit to build
Start the routine while the tank is cycling
The six-week path will make much more sense if you practice the routine before the first animal arrives. Track the water, learn the normal daily checks, and know how you will handle the first water change before you need it.