Poissons du continent asiatique (eau douce) Poissons d’Océanie (Australo-Guinéens) Gobies. Poissons européens. QUELS POISSONS mettre dans un AQUARIUM de 120 litres ? How Many Fish in a Tank Calculator - The Pet Supply Guy. How Many Fish per Gallon The most often quoted “rule” for how many tropical fish per gallon of water is one inch of fish per gallon of water.
This advice works well for most slender-bodied fish, but it is not sufficient for larger wide bodied fish. The one inch per gallon rule also only applies to a fishes adult size, and not the size it is when you purchase it as a juvenile. For fish with a less slender build, you will have to adjust the one inch per gallon rule to account for their larger overall size.