I have noticed a few tiny white specs on one of my clown loach.They are miniscule and i can only see them when i turn on my blue light.It could be just particals of food showing, but he has been acting strange.His dorsal fin is stuck to his back and he hasnt raised it once in the last day.The other clown has been stickign close by but is not acting straneg at all.As a precaution for white spec what shoudl i do.Has anyone else noticed there fish swimmign with the dorsal down..?Please help as i have lost a few cardinals recently and couldnt bare to lose a Clown.