Changed my betta to a 10gal tank, from a 1.5 gal tank, a week ago(Both had/have over flow filters, no air stones and are kept at about 75 degrees farenheit with an undergravel heater). Got the water tested at PetSmart and it tested fine. I feed him Betamin tropical medley. My betta has begun to hide more in the past couple of days and yesterday I did not see him at all after feeding him. This morning he did not come out for feeding until I moved his hiding place and he seemed disoriented at first. He ate some, is swimming around slowly with his fins somewhat clamped, one of his eyes appears cloudy. I used a flashlight to check his body and I can't see anything except maybe a slight bit of film on his head area. Anyone have any ideas? Thanks.