Whats going on here?

[Rusty217]

 

[Tahoe61]

Looks like some macro algae.

 

[Auto-pilot]

Can you remove it???

 

[Rusty217]

Can you remove it???

Haven’t tried to pull on it, I tried to blow it with a turkey baster. No luck!

 

[Auto-pilot]

It looks like a foriegn object. I'd just try to remove it

 

[Tahoe61]

I would just leave be.
If you are not feeding those Micromussa I suggest giving it a try.

 

[vetteguy53081]

Debris. Remove by either inverting and agitating in water or carefully with tweezers.
A slight increase in flow may help prevent this in future

 

[Auquanut]

Looks like a piece of black screen mesh.