I would wait and give the GFO and filtered water some time. The chemical red slime removers have been known to crash tanks, and the cyanobacteria tends to return quickly if there's an underlying problem.
thanks bertoni,appreciate your feedback. Read in sprungs book that to avoid using antibiotics in a reef tank,they are talking about the slimer remover. The DI has not been changed,I am suspecting the last stage of my RO and just ordered some new carbon and sediment filter from BRS,cant wait to flush the whole system out. I never had problems with my red cyano before,this is the first time.
it can reverse sure with a little time and water changes, just remember your rocks are like sponges, they will soak up phosphates/nutrients so even in you have everything under control now or plan to, the rocks will leach it back to the water so it could take time.