These started popping up all over the place.

[Tazman282]

Not sure if good or bad but out of nowhere they have arrived, 100's of them.

 

[David S]

just filter feeders,good for a system.

 

[Smitty]

+1 looks like a sponge. They are good.

 

[Tazman282]

Good to hear, I had what looked like a tube worm or feather duster but he is dead or gone now but then those showed up in the droves. Thanks for your expertise. I find new things in there everyday.