Male sailfin have owned for a couple of years is fluttering around in the tank. There are some of his fry in there with him that have grown to maybe 1.5" inches. The mother died a few weeks ago so he is the only adult fish in there. One of the fry is relentlessly nipping at his fins and the only thing he can do to defend himself is attempt to swim away. I guess i know what needs to be done but wanted some moral support.