Who here knows about odd greenish objects?

FunWithFishes

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So, for about a week now I have noticed an odd green thing growing in the back of my tank on a live rock.

Since its in the back, I kinda forget about it, but today I checked it and noticed a tube growing in the middle.

So anyone have any idea what this is, and if it is friend or foe?

20170707_204739.jpg


20170707_204645.jpg
 
Thanks for the help. I looked some up, and to me, it looks like a clathrina sponge.

Does anyone know if they are good for a tank?
 
All sponges are beneficial for reef tank
 

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