I bought a male Jack Dempsey today and put him in my tank with my female Jack Dempsey. The female was fine at first, flashing her colors and staying next to him, flapping her tail. Then about ten minutes later she started biting him and chasing him. So I took him out and put him in my other tank. Does that mean they won't be able to be comparable in a tank? Or should I just leave him in there for a little and see if she calms down??? Anyone have experience in pairing Jacks?