How big a fish can you have in a 30 gallon?

Answer 1

Big, 12 inches, only because it would be nice if the fish could swim from end to end and turn around in the tank.

About the biggest fish I would put in a 30-gallon aquarium is a firemouth, which gets to about 5 inches long.

Answer 2

The usual calculation is 2.5cm of fish requires 4.5ltrs of water. Do the sums but don't foget that the tank will hold considerably less than it's stated capacity once substrate and landscaping is done and you take into account that the water never goes up to the brim. Your tank will probably only contain around 22ltrs so you would be looking at around 12cm of fish in total length. If you add efficient filtration and air you can double the holding capacity.

Answer 3

any type im sure , it has no range. I dont think:) When it's set up properly with substrate, plants, filter, heater, thermometer, cover glass and lights, the tank will only hold about 25 gallons max. So I would be looking at smaller species like Tetras, Barbs, (small) Danios, Dwarf Cichlids, small livebearers etc. Just remember to use the 1 inch of fish per gallon of water rule.

Answer 4

I would recommend the following:

1x Siamese Fighting Fish

-or-

x6 Neon Tetras/Zebra Danios/White Clouds

-or-

Fill it up with live plants and add some cherry shrimps.

Answer 5

Fish that eat each other are less compatible than those who do not.

Answer 6

If you mean goldfish than you could comfortably put 2 goldfish in a 32 gallon tank.