White stuff surrounding coral…

[paxton.rock]

These weird white skeleton looking things are on my frag and I don’t know what it is. I have 16 frags in my tank and only 2 of them have it. I can brush it off and it will come right back only in the exact same spots in my tank. I thought they were pineapple sponges… but they are NOT. I have no idea what this stuff is. Please help! Thanks.

 

[JGT]

Sponge.

 

[paxton.rock]

Sponge.

What kind. And is it bad? I don’t want them. They are ugly.

 

[JGT]

You can scrape them off. Better to do outside tank. If not you can inject with peroxide. They are not pineapple. Think they are a form of finger sponge.