Something Strange Growing in my tank...

[geckofrog]

Does anyone know what this is? These have started growing on some rocks to, and this pencil urchin...(the white things)

 

[WILDTHING]

I think its a sponge.

 

[fishnut321]

yeah, they are sponges, there a few on my live rock, but they love protein skimmers and filters. The bottom of my prizms are completly covered in the the things!

 

[funman1]

Pineapple sponge.
I have tons of them, mainly in the sump but a few here and there in the main tank.

~Steve~

 

[2fishy]

Yeah, a sponge! I had to ask the same thing when I found one on my polyps. Now I see one inside the prefilter screen of one of my powerheads!

 

[moobar]

yes, it looks like a pineapple sponge. its a sign of a maturing tank.