Please ID

[Sammyr20]

Weird white things growing on my rocks. Any idea what they are?

 

[absolutecarrot]

Weird white things growing on my rocks. Any idea what they are?
View attachment 150538View attachment 150539

Pineapple sponge, not harmful

 

[Sammyr20]

Thanks!

 

[coralfishreef]

Scypha Sponge | Melev's Reef

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. These little filter-feeders are reef-safe. Also called...

www.melevsreef.com