Well, I agree about keeping the params in check. But...as for sociable. I will guarantee that the chromis will start killing each other off sooner or later (if not already). It is likely to happen in a large tank let alone a 2ft. Bangaiis are territorial when they are enclosed in more than a bonded / mated pair - there are 5 in the tank. Also, dottybacks and 6 lines can be extremely aggressive. I have seen dottybacks take on fish 10x their size!!! I could go on.
Anyway, it's a nice looking tank but it will eventually demise somewhat at the cost of the fish and possibly the corals.