I love your aqua-scaping. The caves look perfect. It is funny how some corals will do great in a tank and another type I can't seem to get going. That has been my experience anyway. If GSP do well in your tank, take advantage of it and and experiment with different color forms. I have the light green and a bright, almost neon green color form. The bright color form has longer polyps. I have seen a bright yellow form in a store display that I would love to get my hands on. My only recommendation would be to grow some zoas deeper in the tank as well as up top and more GSP up on the flat rock. In my tank under LED my GSP do better under brighter light then my Zoas. You might find you get quicker growth and better polyp extensions lower near your caves. Let your corals tell you where they want to be based on flow and light, and work your art around their needs. Looks like you have may already have a Torch or Duncan down on the bottom. Can't see in photo. If not consider it. They would make for a great eye piece of eye candy.
