NLS is great... I wish I had found it earlier... tricky to feed, but the fish get the best nutrition from it...
interestingly enough the developer of NLS recommends feeding his food and his food ALONE, as it has the most complete nutritional profile for all fish herbivore and carnivore alike... I must say, i've never seen fish heal fins and color up better with any other food.
bio-enhanced mysis is the best I ever found for coloration and vitality... until I found this... this stuff is great.
I bought a yellow watchman goby, the guy was ghost white and and ate one pellet of the stuff on day one, one pellet day two... by day three his color fully and completely returned... i bought him at the LFS and he'd been sporting that color for a while... but he was in a dark tank so i didn't know how bad until i put him under my 20k HQI ballast radium...
great food for tangs too, they gobble it up... i would recommend getting the small fish formula (0.5mm sinking pellets) or flakes for small fish... the 1mm pellets seem hard to eat for anything under 2.5" which is a lot of fish.
that's my only criticism, for a large reef tank with small, medium, and large fish, you'll need 0.5, 1, and 2 or 3 mm really.. but the stuff lasts forever, it's very nutritionally dense, 1 pellet per inch of fish 2x a day is really all they need for some great nutrition... my fish actually get FULL on these things... blows my mind.
everybody loves them... and CUC seem to mop them up quickly... fish seem to have trouble "seeing" them is the only problem i seem to have, they get used to it really quick tho!