How stunning! Breath taking! What a wonderful paradise for a pony herd!
With MH, you could add some SPS for hitching posts. I would seriously think about gorgonians and sponges. I have found them very difficult to feed. I add live phyto daily and still they struggle. There is a guy on RDO that has a continuous drip of phyto trying to find the secret to keeping them alive. Too big of a pain for me...