Before everyone snaps and tells me this is ridiculous of course I know this is not conventional or appropriate. However they are just in here until I can sell them. The fish store has 10 in a 20 gallon so this isn't a big difference. My question is how long can they stay in here before I have to basically give them away. I'm only asking 10 bucks a fish. They are about 3 inches each. Xp3 filter on it so filtration is no issue at all