Need help identifying...

wil8011

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I appreciate you guys taking a look. Wish I had better pics or a microscope to help identify. Whatever this is it keeps hanging around. Mainly on the back wall (poly), wave maker, and the return nozzles. But it has been attaching/growing on my Stylos, Birdsnest and other hard corals. Causing the polyps to retract and seems to be inhibiting health.

Tank parameter: PH- 8.0, Alk- 9.4, Ca- 430, Mg- 1300, NH³/NH⁴- 0, NO²- 0, NO³- 10, PO⁴- .08, Salt- 35, ORP- 327, Temp 78

I scrape and scrub with weekly water changes. Tank has been maturing good and maintaining stability. It's a 28g and about 8 months old.

This appears to be dark brown in color and moves like algae. What do guys see and how do I combat it?

20211218_213054.jpg 20211218_213252.jpg 20211218_213209.jpg 20211218_213105.jpg 20211218_213133.jpg
 

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vetteguy53081

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Very hard to see true color under heavy blue lighting in picture but may be cyano
 

vetteguy53081

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Under the whites it's still hard, but seems to be more brown. This is my first hiccup being a new reefer.
Does it blow away with a turkey baster?
 

vetteguy53081

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Brown likely diatoms and
Yeah and wipes off really easy. But comes back over several days.
normally occurs within a newer tank and fed by silicates from sand or water source.
Can also occur in a mature tank especially when RO filters are in need of a change
 

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