How many fish can your tank hold?
Enter your tank, add the fish you want, and get a straight answer: whether they fit by size, waste, water and temperament, and why.
Your tank
= 76 L
in
Usual for 20 US gal (76 L). Change it if your tank differs.
Has the tank finished cycling?
Fish and invertebrates
No species yet.
Verdict
Not ready to stock
Cycle the tank first, then plan the stocking.
- CyclingThe tank has not finished cycling. Until ammonia and nitrite both read zero, any fish added is exposed to them. Read the cycling guide.
A guide, not a guarantee. How the verdict is reached
Saved tanks
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Common questions
How many fish in a 55 gallon tank?Which species fit, and how many of each.
Betta tank matesWhat can share a tank with a betta.
Can shrimp live with guppies?Cherry shrimp and every fish in the reference.
How long does a tank take to cycle?Usually four to eight weeks. What to test.
Can these two live together?Check any two species.
Species reference53 species, every fact sourced.