First off, very nice setup and corals. I do have two questions.
1. What kind of tank is that (by whom).
2. I can't help but noticed a tiny creatures on your rocks and sand. Are they Flat worms? If so, do they cause any issues or problem to your corals?
the reason I ask is because I have been having an outbreak of Flat worms in my sump, but none in the display tank.
Thanks