I'm not sure if it is a platy or molly. I'm sure somebody will know. Anyways it seems like another fish has been biting it's tail and it now seems very weak. It hangs out at the top of the water and catches bubbles. Also it keeps it's fins closed up. I'm not sure if it is a male or female. I also do not know what fish is messing with it. When I watch it, it stays by itself. What could be a solution to my problem.