Let me clear up a couple things before this goes on, lol.
Trained does NOT equal domestic. You can train a lion but its still a wild animal.
Hybrid is not domestic. An animal could be a hybrid because of domestication, but they are not one in the same, and vice versa.
In some ways FH could be considered domestic, but it has to be of a specific strain or carry consistent traits that would be hard to breed out, like the kok of a flowerhorn after a few generations. A first generation red Texas for example is not domestic. Maybe tamed, but just because it was born in your tank doesn't make it "domestic"
Other fish can easily be considered domestic. Fancy guppies, swordtails, platies, mollies, angelfish, and possibly oscars could be considered domestic for any of the reasons mentioned and more.
Domestication is a tricky subject, but fun to discuss!
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