Brown algae on zoa??? PLZ HELPPP!

fishnchip

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Hey guys! So my zoa has some weird brown algae growing on it. Any idea what it could be? The polyp is closed and isn't looking too good so was wondering if anyone knew how I could save it?! All my other zoas are looking good and so was this one for a few months so I don't know what's going on with this guy...
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