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Innovative Marine Aquariums

spiral-like white arcs


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these small spiral-like white arcs have appeared on the back of my 24g nano and on a few rocks...seemingly overnight.

 

They are firmly attached and are somewhat hard - like a rock or shell.

 

ideas? issues? Thanks in advance...

pic1.jpg

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Yup, this species is fully grown at 1-2mm. And they're harmless. Scrape them off the glass if you don't like them, but they don't hurt anything.

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