I really like my pair. only see them at feeding if I stay really still. They love their caves, so I built a cave along the glass so I could see into it. definitely make sure the rockwork is supported, not just sitting on the sand. My one rock of Zoos that isn't supported on PVC keeps getting buried and needs to be rescued.
Have caught them out in the open a few times in the early morning before the lights come on full. might have been a mating thing, but no spawn came of it.