I think you all herd from the fungus of my black convicts (i found out here by asking) so i bought riditch +
to cure them, is this a good brand? also, my convicts are male and female why did they fight?

It is supposed to be effective against fungus too.

Your fish can be fighting for a lot of reasons. Some do well together, some don't. Try rearranging the tank, sometimes the 'new' environment is enough to make them forget that they actually didn't like each other (fish are not especially smart). If the male is chasing the female, take him out and put him in a bucket while you do the rearranging. If the female does the chasing, take her out while rearranging. remember to put a lit or something on top of the bucket so the fish can't jump out.

30 years in this great hobby.