I have 2 male (10 inch) and 2 female motoros (12inch) in a 270G 6x3x2. The males have both recently matured. They keep going after one of the females and nipping her sides and edges of her disc. She curls her tail trying to show them the business end but they just don't do anything but nip her. I am a bit concerned if it goes on too long it'll hurt her but I have been told once she is prego they will stop. I can move them around to other tanks if I have to but I would like some pups. Any advice would be great.