I just recently started getting a thick brown algae on certain spots of the sand bed, they appear mid day and are gone the next morning, currently running a HOG.5 and skimmer and recently added a HOG3 when I realized my nitrates were over 80, both scrubbers are growing super thick green hair algae and nitrates have dropped to 5 as of this morning, the brown algae only started appearing recently and has small bubbles attached to it, any ideas on what it might be? and how to get rid of it?