I need to know more about mollies than I have been able to find on the net. I had a silver and two black female mollies and one black male. I had them about three months when the male died - possibly old age because he was at least 3 inches. All was cool. But I wanted a Dalmation mollie and bought a pair about 3 weeks ago. The female died within hours of getting them home. The male took up with the silver female and hardly noticed the black females. Yesterday I noticed one of the black mollies no longer interacting and in the morning she had disappeared - and I do mean disappeared. After taking the entire tank apart I haven't located a shred and she's not in the filter or under any decor. About an hour ago I noticed my Dalmation picking on the remaining black mollie and within a half hour he was dead. There isn't a mark on him, no fin damage or anything, but upon close exam he is a male and I now wonder if the other was a male, also. How do they kill another fish? All I saw him doing was bumping him with his nose, and although I didn't like the bullying, it didn't look lethal. The tank is planted with decor and caves. He hasn't bothered the male platy although I have been told they would interbreed.