That's a really slick setup you've got. Drop a single metal halide pendant (175 or 250w) or even simply double your PC
lighting with another 50/50 -- you'll notice a significant improvement in both lighting and your list of corals will appreciate it greatly.
I wouldn't say you're crowded as your choice of fish is excellent for the situation (and the rockwork is setup quite well) - however, if there were two suggestions I would make it would be this: remove the yellow-tail damsel (you'll thank me later), and add no more fish. Ok, three suggetions -- you can always use more light!
Try taking some pictures without your flash to see the true colors of your tank.