I bought two female balloon molly fish. One might be pregnant, she is also the larger of the two. Apart from this I have four neon tetra, three anacharis, one anubias, one java fern, one amazon sword plants. The larger balloon molly (lets call her yellow) has started to be very aggressive towards the other molly (lets call her black). Yellow seems fine with the tetras though. Poor little black has to go hide in a corner where she stays most of the day Is there something I can do to pacify yellow? I'm not sure what I should do. Help!