One of my serpae tetras has been found laying on the bottom of the tank and he or she looks totally out of it . One of the tetra just keep attacking the injured tetra. Will the injured serpae tetra survive? I used to have six of them . One of them died couple of week ago from infection . But I got the infection under control. I do not want to take the serpae tetras back to the store since I grow to love them and attach to them dearly. Now I have six diamond tetras , two zebra Danios and five serpae tetras . What should I do?