SPS corals, as well as the entire tank, will do much better when they are fed nutritional foods. The oceans that these corals come from are full of food and nutrients for them to absorb. We cannot fill our tanks with this much food because we do not have an aquarium as clean as the ocean. The ocean gets an estimated 100% water change 2 to 3 times per day.
I like this excerpt from an article by Eric Borneman:
Do We Need to Provide All This Food?
I think we do. There are many ways to do be a successful reefkeeper. I think such a diversity of thought and method should be encouraged. I also think the understanding and provision of proper food sources is an important and relatively recent school of thought in keeping aquaria; one that is just beginning to be realized by many. It is a key aspect of natural communities, and it has provided me with visible and tangible evidence of its importance in aquariums. I have crystal clear water and no problem algae with healthy fish and thriving corals. "So what," the reader may say, "Certainly the same can be said for those keeping stony coral galleries with powerful foam fractionators." Yes, it could. Indeed, I was once one of those people and I considered myself to have a very successful aquarium. But now, I have "reef snow" in my tanks, I have copious natural sponge growth, and I have communities of animals that never existed (or did not thrive) in the absence of these food sources. I also feel it is important to utilize food sources that provide maximal nutrition with minimal volume or unused components. In other words, high protein sources (e.g. "Golden Pearls") live or cultured live sources (e.g. Artemia, Mysis, rotifers), unicellular algal cultures (or live phytoplankton products such as DT's phytoplankton), and fresh whole food products (e.g. blenderized seafoods and algae), along with the intentional growth of a biodiverse community acting together as predators, prey, producers, and decomposers, is vital to success in keep coral reef communities in aquariums.
It is my personal belief that reef aquaria should be a thriving community of biodiversity, representative of their wild counterparts, and not merely a collection of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae. By intentionally depriving many of these animals of natural food sources, I think we become lax in our responsibility, even if we did not spend money to acquire them. Dinnertime is a happy time for all, and nutrition is a universal requirement for survival. We may never be able to duplicate the coral reef, but we can get closer and closer as we learn more about closed systems and the natural communities.
On the issue, Robert Fenner says:
What should I feed the SPS and clams?
One of the best foods for SPS corals in my opinion is the food you feed your fish...after it is processed by the fish. I also like Cyclop-Eeze (the frozen offering), Selcon, and vitamin supplements (Boyd's is my fav). Another food which I have yet to try but hear very good things about are the oyster eggs offered by DT's