Throw some of that Red Sea Reef Energy in there or AquaVitro Fuel. You would get an excellent phytoplankton with chlorella delivering ascorbic acid (Vitamin C), carbohydrates, fatty acids, niacin, calcium pantothenate, thiamine, riboflavin, inositol, choline chloride & vitamin B12. It will replenish trace elements too.
There are some other products that are similar, but I feel like these ingredients and supplements will make a difference for all your corals. Start off half dosing because it’s pretty concentrated and you should see the algae start to grow on your glass. It’s excellent to soak some LPS pellet food like Fauna Marin. Drop it on a Hammer or Torch, let it sit there and it should train their feeding response to get better after a few feedings.