unknown growth in over flow

dottiede

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Can anyone identify what is growing in my overflow? this is the large one and it looks like there might be 3 more smaller ones.
growth 1.jpg
growth 2.jpg
 

Brit’s Fish

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It’s a sponge! They’re good filter feeders and shouldn’t bother anything in your tank.
 

A worm with high fashion and practical utility: Have you ever kept feather dusters in your reef aquarium?

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