What is this?!

I think I uploaded a picture haha
If not let me know
Anyway they are these little grayish circles attached to what look like very tiny strings
They are new and weird I was away for two days but cleaned my glass prior and all these things appeared so they must have formed in the last two days.
They seem to be centralized here but I see a small amount on 1 rock

That seems to be it
Ammonia0
Nitrite0
Nitrate2
Salinity 1.025
Temp 78.6
PH 8.2

Stocking
2 clowns
1 bangii
1 skunk cleaner
8 Astraea
3 bumble bee
And 5 red legged hermits...

Let me know what u think!

 

I cant rememebr the name butthey are harmless little fitler feeders. SOme sort of worm someone else will chime in here. They will control their own numbers with available food sources in the tank

 

Those are basically mini feather dusters. They're harmless

 

I see Sperulidae worms.
Coralline
Possibly a macro algae or perhaps some type of hydroids.

Look over this link: Specifically at Myzostomdia:

Worm Hitch Hikers