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Brown stuff on some zoas?

Hey everyone,

Looks like there's some brown stuff covering just 1 patch of zoas.
It looks like a few polyps have melted away.

Parameters:
Alk - 8
Calcium - 450
Mag - 1400
ph - 8.1
temp - 78
nitrate - 8
phosphate - .07

Any suggestions?
 

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