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TRT Staff The Mominator
10,503 Posts
Is it a dusting or a mat? If it looks like dust you've got diatom algae and it's probably an indicator the that membranes and such on the RO/DI need changing.

If it's a mat, that you could sphyon out in a clump or pick up with your fingers, you've got cyanobacteria.

From the "KIll Cyano Handbook" (LOL)
Reduce feeding
increase skimming
syphon the cyano out of the tank
blow the gunk/detritis out of the rocks with a turkey baster
remove the gunk via water changes
redirect powerheads to move more water to the areas affected with cyano


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