When you feed you have to look at it as feeding your tank, not feeding your fish or feeding your corals. Everything in the tank benefits from the addition of food, which is how phyto works. Very few corals actually consume phytoplankton, however, they do consume the zooplankton that eats the said phyto. Dosing phyto will increase your population of pods, sponges, feather dusters, as well as many other organisms you probably dont know are in your tank. These in turn provide food for other animals. I wouldnt expect this to drastically increase growth but it will help. You may also consider adding freshly hatched baby brine as this is a more direct option. If you decide to add anything just be sure to start slowly and not overfeed, if possible always use live as it is harder to overdose since it remains alive in the tank and doesnt decompose as quickly.