Well, if I do the 15x8 tank I was planning on a grey smoothhound, cali horn, brown banded catshark, and a maybe and epi. The gorgs would be the photosynthetic type that I would get mounted and established before the sharks got into the tank but if they get squashed I guess I wouldn't mess with them any more. I have a few friends with large tanks that have gorgs that are literally 3 feet long and pretty beefy! I'm building a custom cree XML LED based lighting system to light the structures with the soft corals with more intense lighting and the rest of the tank with just enough to balance it out. I would be very careful to stick with soft, non stinging corals such as colts, toadstools, misc leathers, colorful shrooms, etc. They tend to be very hardy and much more forgiving as far as water quality and temps go.