What are these?

[nfritz565]

What r these? Seems to just have appeared in last few days, there only in the unlit back chambers of my biocube ? Not the small tiny white things, I know what those are

 

[khushtram]

Sponge

 

[nfritz565]

Thx, is it a good sign? What kind of sponge and should I attempt to remove? I dont know what to do my water chemistry is normal

 

[khushtram]

They are good (filter feeders )

 

[reef lover]

+1 pineapple sponges