ID on algae please!

Deltec

TreyC2010

But baby, the fish need it....
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I’ve been battling some algae for a little bit but I thought it was only cyano. Is this a form of it or have I been wrong about what I have?

My test kits (Nyos, Hanna, Salifert) show undetectable nitrate and phosphate. ICP also shows low phosphate. I don’t feed heavy and keep up with maintenance, but I still seem to have a “dirty” sand bed and rocks.

Tank is 190 total. Two tangs, 2 clowns, flame hawkfish, midas blenny, and melanurus wrasse. All of my other numbers came back good in my icp test too. The algae is red. I blow the rocks off once a week with my pmup. I’ve lost some corals recently and I’m not sure if it’s just nutrient starved from me or this algae or another cause.
 
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TreyC2010

TreyC2010

But baby, the fish need it....
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All strands I posted and saw yesterday were there when lights went off and in the same spots this a.m..
 
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