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Thanks for the response The tank is 9 months old had hair algea around four months ago and got rid of it dont vacum regurly. Here's some picks with a filter lensCurious not to see any on the rocks. Do you vacuum the sand bed much?
You parameters look fine -- the nitrate is artificially low as it is bound up in the algae. My guess would be simple green hair algae. Turf I typically see on the rock more than substrate but could be wrong.
If you can get a better image of the stuff we should be able to narrow it down -- and rule out/in bryopsis.
Manual removal is always good regardless of ID. Keeping substrate vacuumed also good.
btw, tank looks old enough that u do not need to test for nitrite any longer. How old is tank?

Ya it does kida look like that i had Caulerpa that died offDoes it look like this up close?
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if so it calothrix, ive had luck adding nitrate to battle this. It creates an environment macros can out compete it.

