Today I noticed my favorite buddy Loach attaching one of my Mollys. The other day I found one of my Mollys dead and she looked like something had bit her. Then today I saw Loach going after the other Black Molly very aggresivley, and when I walked up to the tank Loach stopped the attach and the Molly went into hiding. My tank is a bit over crowded right now. Could this be the problem? He has been in the community the longest. He has always been very passive and friendly.