About how many fish can live in a 30-gallon tank?

Answer by  mako (289)

Follow the rule of one inch of "adult" fish per gallon. Research your fish and find out how large they can get, then you can calculate the amount to stock.

Answer by  abby39 (213)

The number of fish depends on what size fish you want to add to the tank. The typical rule is 1 inch of fish per 1 gallon of water. So, if you go with fish that are 3 inches in length, you could fit 10 fish in your tank. Larger fish will require more space.

Answer by  abby39 (213)

The typical rule is one inch of fish per gallon of water. You will be able to fit 10-15 smaller fish and 3-10 larger fish.

Answer by  montree (354)

It all depends on the size of the fish. Each fish should be entitled to 12 cubic inches to itself and you do not want to over populate your fish tank because your tank could attract more parasites and filth. It is also a healthy habit to let your fishes roam allowing them to exercise their fins.

Answer by  LianV (183)

I have heard the rule as "1 fish for 1 gallon" but in my experience with aquariums that would be right if they were small fish like tetras. I would have to say for medium size fish 15 should fit comfortably. 10 large fish would also be okay.

Answer by  Jay18 (112)

The general rule of thumb is 1 fish per 3-4 gallons. For a 30 gallon tank I would recommend 8-10 medium size fish.