Derbesia sp. hair algae. Since it is just starting, if you are conscious of nutrients going in (feeding amount, tap water vs RO/DI water, etc) then a twice daily turkey basting to blast the trapped detritus out of the algae strands will probably take care of it for you.
How old is the tank? What size tank? Which skimmer? What fish? Are you using RO/DO water?
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Last edited by Myka; 07-21-2013 at 01:58 AM.
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