Weird White Sludge

[hube]

For some reason I have these in many spots of my tank, some are very large and some are small. Whenever I suck it up with a baster it smells putrid. Does anyone know what it is?

 

[Rtaylor]

Some type of tunicate?

 

[EeyoreIsMySpiritAnimal]

Some type of tunicate?

That was my thought as well... you can see the opening flapping in the flow, lol.
No idea why it would smell bad though...