Hi people . I need your advice on on this algae problem. Its been with me now for the last 2 months and sreems to be getting more apparent. 2 weeks ago i changed 50% of water as my nitrates were through the roof. I though this might have solved the problem. At present my nitrates =0.5 pH=8.2 PO4= 0 KH=10.2 Ammonia=0 I have a 100gal reef tank up and running approx 1 year. the algae is a brown colour with tiny bubbles all over the sand and live rock. Any info please please.:help: