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Tanker Bob

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I just saw this sprouting up yesterday. They are small, white and kinda look like a mushroom. The other bright white stuff is sand/gravel from goby.
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Acetabularia calyculus.
 
+1

These are actually really amazing. Each one of those umbrellas and stalks is a single cell. I had a couple on the backs of snails before that looked like they had satellite dishes.
 
Thank you all for your assistance. Sounds like this is not a harmful algae and may get eaten. I'll watch to see growth.
 

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