Corals don't eat phyto, they eat zooplankton. However, it is not needed at all and usually just adds excess nutrients
I mean feed sparingly but like I said corals eat zooplankton not phyto
It would be better than phyto
Any liquid or powered food that you add to your tank is like adding liquid phosphates...infact that is exactly what it is. There is no need to use any type of food like this if you don't have non-photosynthetic corals.