Re: Can anyone share experiences with crenicichla compressic
They absolutely hate each other, so it's good you only have one. I when I say hate, I am not exaggerating. A keeper in Europe had a pair kill off his entire group in a 10 foot long tank. Pretty amazing for a 3" fish.
As fishNAbowl said, smaller fish will disappear. Don't assume that the fish is too big to eat, I watched my pair kill off 11 of 12 ember tetras by grabbing and crushing their heads even though they couldn't possibly swallow the fish.
I kept them with both dwarf cichlids and larger centrals. Oddly, perhaps, they were fine with the dwarves (a little chasing near the male's cave and at feeding time but otherwise left them alone) but the male killed two much, much larger central american cichlids. Pikes don't appreciate bluffing and posturing much, if they get into a fight they mean to end it.