I have isolated this bully

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At the first day of March I've decided to go for a major water change and cleaning of aquarium. But also transfer this flower horn fish into the smaller tank. The reason was that he bullied three of my koi carp and there is only one left. I should have listened back then that this fish is not ideal tank mate. I still have four mollies, two iridescent albino shark and one koi carp left together now. Mom suggested plants but they're not practical now and too expensive for me. Have a nice day.