ok, for the past several weeks my 5.5" silver aro has been just fine, eating and loving life. I moved him to his new tank about two weeks ago and he's was still fine, but out of nowhere he is now stopped eating and is no longer swimming. He just floats at the top of the tank in a C, all curled up. He's been doing this for about three days now. The parameters are all great, ammonia-0, nitrite-0, nitrate >25ppm. Water Temp 78 F. I have no clue what could have changed....Has anyone ever seen this, or know what may have caused it????