The inch per gallon rule is flawed and it should not be considered. The inch per gallon doesn't tell you about compatibility, aggression, potential size of the fish, temperature between species, diet, or anything. All it does is tell you to put fish in an aquarium that can be housed according to gallon size. Seriously, would you want to put a 10 inch fish in a 10 gallon aquarium?The suggested rule is one inch of fish per gallon. And 5.5 gallon tanks are very small.
Yeah never listen to petco petsmart or pet supermarket employees they most of the time have no idea what they are talking about and do you know about the nitrogen cycleThank you all, I'm only 16 and still learing. I guess I was fool to listen to PetSupermarket
"Yeah they'll be fine. Different breeds don't matter."
I most of the time don’t though unless they say that oscars can’t go in a bowl because my little brother has a beta in a bowl (and that’s not ok) but when we got this beta he wanted a OscarI wouldn't say that you should never listen to employees at a big chain pet store. Some of them may actually know about fishkeeping.