As of last night I completed a 100% water change for my crowntail male, but I decided that I wanted to switch his tanks, moving him into a square 2 gallon tank previously occupied by minnows (I moved the minnows into his 1 gallon vase). I've had him for about a month and a half now and this is the first time I've switched his tanks since purchasing him, although I usually preform about 2 100% water changes a week with water conditioner. However since placing him in his new tank he's been acting strange, darting around when I come close to the tank, twitching when he swims, and otherwise floating near the surface breathing heavily. He's gone from clamped fins to completely flared out, and my sister said he attempted jumping out of his tank (but it's covered so he simply banged into the top). When I came over to look at him he started vigorously slamming into the sides of his tank, and then he suddenly went limp, floating to the top on his side. I thought he'd killed himself, but I think he may have just knocked himself out because he recovered within a few minutes, back to floating near the surface and gasping. He refused to eat his pellets today, and after placing him in the tank and knocking himself out he temporarily paled in color and gained horizontal stress lines. I honestly have no idea what is wrong with him, but I'm hoping this behavior can be reversed because if it continues or even worsens I'm afraid he'll kill himself...