I think I had something to actually post before I read a certain line and died laughing.
Spanking a fish?
Oh, right. My point.
Jack Dempseys and Oscars are entirely different species - they are indeed both cichlids, but... Have you learned about the phylogenetic tree in biology yet?
Cichlidae is a family. Bovidae is also a family - have you ever heard of a yak or cow and a sheep breeding? No? It's partially because they don't really cross paths, but also because they CAN'T.
What about Family Mustelidae? Have you ever heard of a Badger and Otter hybrid? They don't succeed. Otherwise, believe me, someone would have tried to make it a pet before.
That's how "close" families are. Hybrids usually arise out of the same GENUS, not family.
I'm not trying to stop you from breeding hybrids, just encouraging you to try more feasible pairings.