What is this???

[Sarah1518]

Hey guys I had this white thing pop up in my tank yesterday. Any ideas??? Kill it with fire or cultivate it??? The life long reef tank question. Lol

 

[ltmsc]

Looks like a pineapple sponge to me. Harmless.

 

[redfishbluefish]

Appears to be a Pineapple Sponge.

 

[Maggie321]

Agreed. Pineapple sponge. They are common. But I would just ignore it. They are common in new tanks

 

[Sarah1518]

Thanks everyone!