The Oyster Eggs in it are for the SPS. Phytoplex won't feed SPS as they are carnivores.....some non-photosynthetic corals feed on phyto. However, other corals don't. It's often found in the guts of polyps but it's undigested. (Phyto feeds some animals that spawn and the eggs and sperm can be utilized by corals....so it does indirectly feed SPS).
I personally love Rod's Food.