Crazy little Pineapple's??????

[speckrb]

I am trying to ID these and can't find anything resembling them. They break off easily if you touch them or when I moved the rock around. They look like little pineapples to me. The rock I bought was "fully cured" from petco and there was nothing on it at all when I bought it. There was not even a stitch or corraline algae on it. These just started growning. I can't find anything on this site or the referenced links. I have several Baensch books also - no joy. Any ideas? I do not think these are Aiptasia.

40gal fowlr
seaclone 150 skimmer
8 lbs LR
2 clowns
2 red legged hermits
78°F
0 Ni
0NA
.25 ph
8.0 ph
0 Am
1.230 sal

 

[redneckgearhead]

pineapple sponges there fine little filter feeders I believe

 

[Jaybird]

+1 on sponges. They are filter feeders that are beneficial. They will do no harm to your tank and only help filter the water.

 

[speckrb]

Thank you very much. It's much easier to learn about them when you know what they are. Awesome.