I'm a little confused about what your problem is, but it's generally not a good idea to put 2 bettas in a small bowl, even if it is just 2 females, they can still fight. Also the water quality might be poor if the bowl is too small. What size bowl do you keep your betta in, and how often do you do water changes? Do you dechlorinate the water? Also, real coral I know can be harmful for some non-salt water fish. Does anyone have more info on this?