Yes I do think it's a waste. If you feed your fish, the corals get food. If you got rid of all of your fish, it would be worth it. The amino acids are in range of 5 to 25 microns which are good for sps. Think about it, even a filter sock has a limit of a 100 microns in this hobby, even a protein skimmer has a limit of 30% of all doc's. There is nutrients in your system, I stopped feeding my corals six months ago and have seen better results in water chemistry.