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Brown film covering Zoanthids (1 Viewer)

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chrfrancis

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Hey all, today I just noticed a brown semi hard film that is growing on a couple of my Zoanthids colonie.

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9e6032481c24318438a9f3a7cbb4f1c2.jpg


I didn't think about it before but realized that it completely covered a fire and ice colony and killed it off and now it started on the colony in the above first picture. I was able to scrape most of it off with a tooth pick.

Does anyone have any idea what it could be and/or how to prevent it?

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