Well i thought it was a lot overstocked in my eyes, i am under the impression that you stock a SW tank less than you would a FW. I suppose that it also comes down to how well filtered the tank is!
It looks like there's an awful lot of live rock in there so presumably ample filtration for all the fishies Beautiful tank. You could watch it for hours.
yeah it does look crowded as anything to me, but stocking is totally different for saltwater, you've got all sorts of things to consider like the extra volume of water in the sump and so on.