Beginner Saltwater Fish
Compare beginner fish and learn how adult size, diet, and temperament affect your choice.
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Fish, coral, cleanup crew, and more
Saltwater Aquarium Livestock Guides
Choosing livestock is one of the most exciting parts of building a saltwater aquarium. It is also where things can get complicated really fast if we buy first and ask questions later.
I built these guides to help you figure out what actually fits your tank, what can wait, and what I would skip. Start with the animal you are thinking about, and we will work through the important stuff together.
Browse the livestock guides
What Do You Want to Add to Your Tank?
Choose a topic below and open the guide you need. Every card takes you straight to an article or a clearly labeled flashcard deck.
Fish
Choose your fish, plan the whole community, and prepare to bring them home.
How Many Fish Can You Keep?
Plan how many fish your aquarium can support by looking at the animals, habitat, and filtration together.
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Fish Compatibility & Stocking Order
Build a compatible fish list and decide which fish to introduce first and which to add later.
Read the guideCorals & Anemones
Find the right coral for your tank, learn about anemone care, and prepare for new arrivals.
Choosing Your First Coral
Compare beginner corals and choose one that fits your lighting, flow, and available space.
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Bubble-Tip Anemone Care
Learn what my anemone failures taught me about stability and keeping bubble-tip anemones long term.
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Coral Dipping & Quarantine
Learn how inspection, dipping, rinsing, and quarantine help reduce the risk of bringing coral pests home.
Read the guideCleanup Crew
Start with the work your tank needs done, then choose animals it can keep fed.
Choosing a Cleanup Crew
Choose snails, crabs, and other cleanup animals for the jobs and food your aquarium actually has.
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Cleanup Crew & Invertebrate Flashcards
Get to know shrimp, urchins, crabs, and other invertebrates through photos and basic care facts.
Explore the flashcardsMacroalgae
Learn to recognize common macroalgae and marine plants with the identification flashcards below.
Macroalgae & Marine Plant Flashcards
Learn to recognize common macroalgae and marine plants, with photos and introductory care notes.
Explore the flashcardsLearn the animals before you shop
Learn to Recognize Common Aquarium Animals
Want a simple way to get better at identifying the animals you see at the fish store? Practice with flip cards for common saltwater fish, corals, macroalgae, cleanup crew members, and other invertebrates. Look at the photo, make your best guess, and then flip the card to check your answer.
Beginner questions
Saltwater Aquarium Livestock FAQ
What should I add first to a new saltwater aquarium?
There is no single first animal that works for every tank. Make sure the aquarium is cycled and stable, then look at the tank size, the animals you eventually want, and the food and habitat the first animal will need.
How long should I wait before adding fish or coral?
Do not rely on one calendar date. Make sure the cycle is complete, the temperature and salinity are stable, the equipment is working, and you can repeat the basic maintenance routine. Those things matter more than the number of days since you added water.
Can a cleanup crew fix an algae problem?
Sometimes the right snail, crab, or urchin can help with a specific problem. But first you need to identify what is growing and why. A cleanup crew cannot replace better lighting, nutrient control, manual removal, or regular maintenance.
Are anemones beginner livestock?
Not automatically. A Bubble-Tip Anemone needs a stable tank, appropriate light and flow, room to move, and protected pump intakes. And just so you know, clownfish do not need an anemone.
Does “reef safe” mean an animal will never cause a problem?
No. “Reef safe” is a useful starting point, but it is not a promise. The exact species, the individual animal, its adult size, how hungry it is, and what else lives in the tank can all change the answer.
Should I quarantine or inspect new livestock?
Yes, but the process depends on what you are buying. Fish quarantine is not the same as inspecting and dipping coral, and neither one is the same as observing an invertebrate or checking macroalgae for hitchhikers. Use the guide for the exact animal.
Before moving on to Step 5
Make sure you can care for the animal after you buy it
A fish, coral, snail, or shrimp does not just need a safe tank today. It needs a routine you can keep doing next week and next month. Make sure testing, feeding, water changes, and basic equipment care are already part of the plan.