cyano in refugium?

~SIRENA~

New member
I have cyano growing in my fuge. I've scraped it off, but it keeps coming back. I've increased the flow and it won't go away. I don't want it to transfer to my DT. I've also added some phosphate sponge media. I don't have an algae problem in the DT - a few diatoms - I added some sand.
Any suggestions to make it go away?
 
Ammonia 0
Nitrates undetectable
ph 8.0
gravity 1.025

sump is 29 gallons with Chaeto and LR sandbed is 2"
 
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