I really don't know what kind, I am new to reefing so this is going to be a learning process for me. Much more difficult and scientific than I ever thought. I do realize that identifying the algae would go along way towards resolving the issue. I have heard dinos and I heard red slime so not positive which one yet. Tonight I added a phosphate reducer, cut my lighting way down and I am attempting to dose hydrogen peroxide. Appreciate your input for some possible solutions.