My betta doesn't seem to have any physical affliction (i.e. ick, bacteria, etc) except for perhaps his fins being a little thin and not spread in all his glory. However, he's been lethargic for a couple of weeks now and hides at the bottom of the tank in his rocks. It was recommended that I...

I have had my fish for about a month now, he was originally in a bowl but about 2 weeks ago I switched him over to a 2 gallon tank. I use water conditioner and installed a heater a week ago. He fins started to open up finally after being in the awful pet store conditions, but now his fins seem...