I just got done destroying my cycled tank by treating my tank with maracyn and maracyn II. For 2 of my panda cories that had white fuzzy patches on them...they both ended up dying. I just added TSS to get my cycle back and now I notice that another one of my panda cories has part of his tail missing, it's red around the base of his tail and the remaining part of his tail has white on it (not fuzzy)...and another panda cory has slight tail fin damage. I give up! I'm not medicating my tank again. I think these panda cories are adorable and look awesome in my tank....but this is driving me crazy.