Today I bought a betta at Petco to go in my 14 gallon tank (already inhabited by two ADF's). When I got him, he seemed depressed and pale- but I chalked it up to living in a tiny cup for a long time. I acclimated him to my tank more quickly than I would have liked; it took around 30 minutes. At first, he explored the tank and swam normally. After half an hour of swimming, he retreated to floating behind the heater at the top of the tank or swimming right next to the filter. He'd move if I jiggle the heater/filter, but return once I leave. I got worried that he might have a bacterial infection, so I moved him to a quarantine tank (1 gallon Kritter Keeper). Now, he's swimming around normally and seems happy in his little one gallon plastic box (no weird floating). Is this normal? Should I not keep him in a 14g?