Hmm, I think generally flowerhorns should be kept by themselves, but that is just what I have read. Catfish might live, and the convict idea could work, if you have solidly-constructed rockwork that the flowerhorn cannot get into, as mentioned. You could perhaps try to pair up the flowerhorn, that might be interesting.
I am new here, but I am unsure what a zzp is, so I don't know what that might mean for your future plans.
I am new here, but I am unsure what a zzp is, so I don't know what that might mean for your future plans.