I like the lights but plan on taking out quite a few of the whites and replacing with royal blues. I am barely running my whites channel and am about as blue as I want to be, but I would love to be able to crank down on the blue channel some. I have not been good about chemistry at all and have not regularly dosed anything, shoot, I didn't do a water change for too long so I'm not getting great growth on the corals but that's my fault.
As for the Sand dollar, it's a pretty hearty coral and if you can keep Pokerstar or Sunset this is pretty similar in demands. Not quite as easy as an orange cap or digi. Those will just about grow in my driveway! The Sand dollar gets nice pink polyps with a baby blue tissue, pretty coral.