Well, I had put some fancy guppies in my tank a few weeks ago with my platys, swordtails and betta. The platys, swordtails and betta got along very well. When I got the guppies everything was okay for about a week, then I noticed the Betta hiding alot. I moved him to his own tank and he is doing very well. Making bubble nests and flaring at me. Then the swordtails and platys started hiding and stuff. I watched for a couple of days. These guppies must have been bred in the mafia or something! They would plot in the corner and then roll each fish in a group! I have never seen fish that are supposed to be COMMUNITY fish do that!. Guppies went to the pet store today, for possible new homes. The activities of my swordtail/platy population has been restored and the fish in my tank seem alot happier.....never putting guppies in again! I want to thank Fluttermoth especially for letting me know the signs to watch out for, expecially when it came to my Betta 
