Ok... I have 4 male fancy guppies and they get along fairly well, (they were friends until this week!!!) They usually shoal together and search for food and play... until...
like one week ago, the fighting for the dominant male began... the smallest little youngest guppy started fighting the biggest one with the largest, most colorful tail...
then the turn was over then, like two days later it was the next guppy (fighting against the largest one again), then the other one, and the next one....)
I had to break up the fights!!! and now they seem peaceful again... but with concequences. Now, my biggest fancy fancy tail, the dominant one with the longest tail has it now SPLIT IN HALF!!!!

and another one of them has a little bite on his that has the exact shape of a little guppies mouth
How can I help them? is there any medication that I can give them to help them regenerate their tails? like vitachem or something like that?