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They're dirty little micro algae often appearing brown and grouping together in a mess... the long filamentous algae you see here together with my dirty diatoms is GHA (green hair algae) the gnarly film on my back glass is both GHA and cyanobacteria. Recently had a sea cucumber die after purchase and push my tank into a cycle. Added bacteria and daily water changes to get the ammonia out.What are diatoms

