iirc you need tyobe careful with what sort of rock you use as it affects water acidity and other factors as well, these types are form unique environments, a mate of a mate has a thriving seven foot tank of them, wall off stone caves theme, its incredible community to watch, pecking orders are established but interchangable, I tink as with discus to a degree over time they have become more robust and somewhat easier to keep, Im sure the set up Ive seen did not have natural rock, , the lad may of weel modeled it himself all try find out
some nice tanks on this thread,