I just recently recieved a black wolffish, and noticed him today breathing hard and gasping at the tank surface... He's been in the tank for 2 days and only started this behavior today. There are 5 various cichlids and 4 bichirs in the aquarium and none of them are exhibiting any of this behavior. I have done a 50% water change to see if that would help, but I was just wondering since he is the only new fish to the aquarium could he still be acclimating, or maybe he has some sort of parasite? Just don't want to medicate the aquarium if not necessary.