Actually, yes...if two random fish happen to breed in your tanks, they should be culled. If you're purposely trying to create some kind of hybrid, like the Flowerhorn or something, and MARKET these fish as hybrids, that's one thing. If you have two fish in a tank who just happen to breed for lack of having actual partners of their own species, kill them. What are you going to do with 50+ baby mutts? You'd either give them away, or sell them to a store. Even if you sell them as hybrids, you know damn well the store is going to market them as purebred something or other, or give them some stupid made up name to make them sound exotic, and stick a ridiculous price tag on them. Then some uneducated buyer comes along who doesn't know a cichlid from a guppy, buys them because they're pretty, they breed, those babies get distributed as pure blah blah....and so on and so forth. I don't know what fish you keep, but in the case of African cichlids in particular, is disgusting how badly hybridized local selection is these days. Its next to impossible to get actual, purebred Africans from a LFS, and equally hard to find nice, pure specimens online. I'm sorry, but if I walk into a store and buy a fish labelled 'Yellow Lab', I damn well expect to get a purebred, true-to-the-species Lab. Instead, every single bloody yellow lab you find in stores now, is a hybrid - those STUPID 'all yellow' labs, and most people don't know the difference until they get the fish home and do a little research, and we have to inform them that they've been dupped and bought a mutt fish. Complete bull****.