Hoping these are not hydroids...

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Colin Threepwood

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Just noticed these guys last night. It is in the lowest flow area of my tank. Currently fighting high phosphates, running gfo in sump.

If hydroids, my plan is to remove the whole rock and treat with hydrogen peroxide and some brushing.

PXL_20250111_043625635.jpg PXL_20250111_043644235.jpg
 
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