Not sure what this is

[diablo243]

Pic is hard to see but just noticed these all over the wall in the filter chamber of my all in one tank. Can grab them with tweezers and seem to have no response of movement, not sure if good or bad. Thanks all

 

[Lionfish Lair]

Look up pineapple sponges.

 

[diablo243]

You wicked smat! Lol thanks that seems to be it!