What is this thing in my tank?

Anarcha0s

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Saw this green thing in my tank and I don’t know what it is.

D0AACBD6-1C56-47CE-A53F-FA618E6F6B58.jpeg
 

Crabs McJones

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Saw this green thing in my tank and I don’t know what it is.

D0AACBD6-1C56-47CE-A53F-FA618E6F6B58.jpeg
Either a sponge or tunicate would be my guess both are harmless filter feeders.
 

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