i have recently aqcuired 3 danio's. 2 zebra, and one leopard. the leopard is looking rather rotund, but doesnt seem to eat any more than the two zebra's. it keeps getting chased by the other two as well, but its not violent chasing, kinda looks like they are playing follow the leader. is it possible that the leopard is a pregnant female and the two (smaller) zebra's are males?