I have a 20 gallon long with a group of breeding ocellatus. I think I have 4 females and 1 male. I know for sure that the largest one is the male, but there is a slightly smaller one that I think is female but it could possibly be male too. Every single fish has fry in their shells so it's hard for me to determine. I'm wondering if there are some pointers out there to help me distinguish. Thanks.