so i think my bass maybe blind ?..... he has lost all of his black bars and is just a like VERY pale green and when i drop food in he only eats it once it hits him in the face he never "attacks" it like he did before id walk up to the tank and if he was hungry he'd be swimming at the top waiting for it to be dropped in ... could he be blind ? if so what would cause him to go blind outta the blue like that ? he in a tank by himself, temp at 85-86 with a powerhead sucking air into the tank and a HOB filter so it getting surface aggitation, he only about 3-3.5" anyone have any ideas ?