What is this????

[KentuckyReefer]

Any ideas? It's growing on the side of my friends tank. He said it popped up last night.

 

[Diesel]

Help me out here, are we looking at the green stuff or the polyps that are attached to the glass?

 

[ahiggins]

If you're looking at the stringy things, they're spaghetti worms. Good guys

 

[KentuckyReefer]

Thank you!!