Good points made by all. I've found that their are many exceptions to the rules as far as temperament of cichlids goes. But I honestly don't believe this applies to flower horns, I'm convinced they must be kept by themselves.
That is strange,I have found very few plants that these fish wont munch on.To make it more strange he keeps schools of Rainbowfish with them in a dutch style planted tank.
Personally don't have much of a issue with good quality flowerhorns, nobody has ever sold one as anything but a flowerhorn. As for stocking I personally wouldn't try just 2 large aggressive male ca cichlids in a 120 gal even if they have been raised together as babies.Wow that's a lot of different opinions lol, in the end I've decided if any of the fish are staying it'll be the the red head, the flowerhorn gets along quite well with the red head it's the oscar that doesn't seem to be working out, and also on the subject of keeping flowerhorns with other cichlids without much aggression it depends on if there raised with other fish from young, if so they could work very well in a lot of tanks, I feel like the only reason people question flowerhorns is because of negative things said by purists in the hobby