I have a couple of med. sized loaches. When we first got them two of them (the largest and med. sized were fighting over status) The next day the big one had obviously won as he was strutting the tank while the other one stayed in the cave. Well, it appearst that the big one was hurt alot. He has several bite marks on him and I noticed tonight a slash right below his eye ball. There is one more (the smallest one, we have 5 in a 38g long tank) has a slash below his eye too but no other wounds. They are not doing well. They are laying on there sides and only moving when they need to. They are not socializing at all. I am on our second day of treating with Melafix. Should I wait and see if they make it past this or euthanize now. What are the chances they will make a good recovery?