[Hmm I have to disagree with marc on this one... I think SPS are one of the most voracious eaters out tehre, thing is most people dont feed the right size food.
I dont target feed my SPS, I feed the whole tank a slurry of homemade food I get from the Asian Market.
5 Tiger Shrimp minus the shells (eyes and heads are good)
5 Fresh Oysters - minus shells
6 Live Fresh Water Clams - Minus Shells
6 Whole Smelt
1 Lbs frozen sea food meddly (has baby Octopus, crap meat, shrimp, etc) this is no Bagged, its fresh-frozen?!
3 sheets Roasted Nori Soaked in Distilled water
6 Capsule Contents Cod Liver Oil
2 Cups of your preferred Flake Food
1 Bottle Cryo-Plankton
As Much frozen cubes of Food as you want
Cheap 10$ food blender
The last time I was at the market, a customer was having some fresh fish cleaned and gutted. I asked for the innards (Stomach, heart, all that gross stuff). But I know that the internal organs are VERY high in Fatty acids and Iron. It was free and am sure contributed to the nutritional value of the mix.
Basically - Blend each item and then add the next, I get a soupy slurry from this which I put in Ziplock Baggies flattened out. Then Freeze for easy breaking apart. The food is very liquidy and I can see the SPS polyps grapping something when I feed.. Some of the larger polyped SPS I can see activelly grabbing pieces of food. My corals do great and I can say Ive seen colors get better after feeding for a week. The fish love the food and I think this activelly feeds the whole tanks ecosystem. The water is cloudy for about 30 minutes, but it clears fast.
Once I bought the Food Chopper.... This cost me about 7$ to make a months supply of food. I feel much better feeding a mostly natural source of food then all flake food which is high in ash and other non-food items.
IT is smelly, expect to take about 45 minutes preparing the foods, cleaning the shrimp, shucking the oysters.
I dont think you can get any better for your tank though, feeding corals, fish and the small animals in your eco-system all at the same time.
Hope that helps some.]