Zoas melting/brown? Help!?

[CheetoReef]

Hey guys,

got these zoas that werent doing good in low light, moved them up well over a month ago, started doing much better.

its always had this brownish/purple crap on them. Totally isolated to only the frag/plug.

any thoughts?

no3- 15-20
P04 0.03
8.1 / 400 /1350

 

[CheetoReef]

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