I have 5 Glofish (two female and three males) in a 20 long, and there has been a lot of aggression lately. They've been in the tank for several months, and although one male in particular has been aggressive in the past when it comes feeding time (when they see me approach the tank), it has gotten really bad now. I watched them this morning for several minutes and two of the males were harassing one of the females (not sure why they didn't really bother the other female) non-stop to the point of exhaustion. I removed one of the more aggressive males and placed him in a breeding tank temporarily until I can get the issue resolved. The one I removed was the latest addition, and has been the aggressor in the past, but not to this extent. And now the other two males seem to have picked up on his behavior and have been ganging up on one of the females. What should I do? Remove the males and put them in their own tank? Get more females to outnumber the males?