What is this thing?

[theredcenter]

Wondering if anybody knows what this thing is.

 

[JTP424]

Pineapple Sponge :) Harmless filter feeder, means your tank is healthy.
They don't hurt anything and will appear and disappear randomly.

 

[theredcenter]

Pineapple Sponge :) Harmless filter feeder, means your tank is healthy.
They don't hurt anything and will appear and disappear randomly.

Thank you!

 

[gabriellar]

that's a huge pineapple sponge lol, did not know it can be bigger than zoa

 

[theredcenter]

that's a huge pineapple sponge lol, did not know it can be bigger than zoa

I have about three that I can see. Various locations, roughly the same size.

 

[56longroof]

that's a huge pineapple sponge lol, did not know it can be bigger than zoa

I had one in my sump the same size as my thumb.