so as you can tell dont get a bala i had a bala in a 10 gallon when i first started and it died i thought 12 inches (bad info yet again from petsmart) and 10 gallons well he wont get big enough and ill have a bigger tank wrong died at about 3 inches long i was mad pug was has a good idea though rainbow sharks a pretty, get about 6 inches long (i believe) and a peaceful fish ... really you cant go by in./gallon or any rule as stated above you have to go by will the fish be able to turn around when fully grown? can my filter handle the bio load? and what are the fishes needs like giant danios only get about 4 inches but need much more than a 10 gallon