Check flow in that area as well as your nutrient levels. To get rid of it really quick is 2 or 3 day lights out but it will return if you don't address flow and nutrient export.
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What about water changes? What are your current parameters (nitrates, phosphates)
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I have dealt with this just recently.... increase the flow lengths wise of the take so that the sand isn't tossed around.
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Its just a little bit and may just go away with time...
Just siphon it out with your next water change and see what happens..
If it keeps spreading turn off the lights.. wrap the tank in a towel or something so no stray light hits it. and leave it like that for 2-3 days.. It will be gone. Your corals/fish will not be seriously effected by the lights out..
I've found "flow" to be mostly ineffective with cyano unless you are literally blowing it off whatever its on but thats just spreading it somewhere else..
40 breeder with a 40 sump.At this point get the nitrstes down and do a 2 blackout and you will be good.... Just get the nitrates under control.
How big of a tank?
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