Is this algae?

marcwjj

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Sorry, noob question: what is this greenish thing with a yellow lined circle in the middle? They seem to spawn in the last 2 days. Thanks!

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marcwjj

marcwjj

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Thanks all! Did some google search , I don’t see any live tentacles or things inside the circle, so it seems more likely to be tunicates. I will keep an eye on how it develops.
 

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