Weird Thing on Glass?

[acraddock]

Has anyone seen this before? It popped up on my glass overnight.

 

[timeconsumer]

It's an interesting one for sure. I can venture a guess that it's maybe some sort of lattice/lace bryozoan? Or maybe just a sponge? Or maybe a strange branching hydroid colony?

Either way I doubt its anything harmful.

 

[silentdeath5]

Baby sea dragon. One can wish

 

[ZapataInc]

Maybe snail eggs?