nice size tank man, i had a problem with cyano some time back despite having perfect nutrient levels, i ran a storm cycle for 3 days ie switched off my lights and increased flow slightly, figured its a natural part of the reef, when i turned on lights again no more cyano and no more hair algae in display, my sps and my softies all did well and had good polyp extension after.
i do have an algae scrubber and kept that running which also probably assisted the process but... i believe in a storm cycle, no chemicals and no manual removal involved
im no reef pro, but it worked for me