Green tube?

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salty27

Aquarium Advice Activist
Joined
Apr 5, 2004
Messages
116
Location
New York
Have had this green tube-like thing slowing growing on my LR for the past couple of months...any ideas what it could be? Have never seen any worms or fans coming out of it, and it is stationary and doesn't move.
I know it can't be harmful, but I am curious as to what it might be.

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