Critters on Sump Glass

[SaltwaterNuB]

Not sure what these are. It's a 40g sump that's been running for about 4 months. I scrape them off and siphon them out. Does anyone know what they are? I have a octopus skimmer, and a phosban reactor. If that help...

 

[Crystal A]

Looks like pineapple sponges. Harmless filter feeders.

 

[SaltwaterNuB]

Oh cool. Thanks for the quick response.