What the heck are these?

[pjewett]

I have maybe 2 dozen or so of them and they seem to all be in low light areas..especially around my intank fuge. They look like pale pineapple shaped things.

Anyone have an idea? Are they good or bad?

 

[Arati]

its a pineapple sponge lol .. harmless and proly a good thing

 

[pjewett]

cool. thanks!

 

[reefman]

courtesy of melevsreef :
This is a harmless Scypha sponge. They are very small, and usually found in our overflow boxes and down in the sump. Attached to rock, glass or acrylic or even your plumbing, they may be about the size of a grain of rice or perhaps larger, like Debi's above. These little filter-feeders are reef-safe.