What an amazing cat! there's a zoo round where I live, at a certain time of day which was the highlight they would put a side of beef at the top of a telegraph pole and release the Sumatran tigers which had to climb the pole to get the food, stopped them becoming lazy feeders and made them work for their food like they do in nature. Even when you throw a ball for a dog its just fulfilling its instinct to chase something down and fetch it back to the pack. I talked my brother out of getting one of those collars that gives a little electric shock for his dog which kept barking at passers by while he was trying to kip for night shift. That's what the dog is meant to do, he's warning the pack of something coming while other members of the pack rest and he is its pack. Its akin to the frozen snake story where the guy defrosts it and the snake bites him. You knew it was a snake when you defrosted it, you knew it was a dog when you bought it so don't expect it not behave like a dog. But then again, my brother already thinks I'm nuts anyway 😀
Same applies to the Flowerhorn. its instinct is to clear an area and being such a big powerful fish that's quite aggressive it will have a go anyway even with a large rock running the risk of smashing the tank or injuring itself so what do you do. I suppose the only option is to put something in there to push around that won't do any harm. The glitter ball doesn't seem so Psychopathic now does it? I was actually thinking about something like a couple of dogs rubber bones that it could shove about, imagine if I'd posted a picture of my fish with a couple of rubber bones in the tank 😀 Ultimately he'd just put something that attracts attention in to keep the fish occupied. The fish has fulfilled some of its needs, its seen something that's caught its eye, evaluated whether it flight or fight time, decided to take it on and push it around out of its territory and more importantly kept itself entertained for a while. No harm done, just looked a bit weird to us but no weirder than say someone on a cycling machine in the gym but then driving home in the car I guess.