I have either a 25 gallon or 30 gallon tank at this moment. I measured it to be 25.some more numbers, but the person from the lfs told my mom it was 30 gallons. Whatever, not that much of a difference. Anyway, I don't have a job or anything, but whenever I keep asking my dad to get new fish he doesn't. Wanna know why? Because there's a freakin' Bala in there. Suprisingly, he's doing extremely good and not hitting the glass with his head. He's also accompanied by his two best friends who are Black Tetras. I was wondering, though, what fish would do nicely in a 30 gallon (I'll use this) together because since it's my B-Day, I can exchange these and get different one's. Please help! Thanks.