My boyfriend gifted me two Senegal Bichirs last year for my birthday (March). They were fairly small so I don't know how old they are. This morning upon feeding I noticed my bichirs "laying" on top of one another. Upon googling, I realized they may be cupping. Right after my larger bichir had this *pictured& coming out of her anal. Is it poop or what is going on ?. They are in a 100 gallon tank with African and SA Cichlids.