Soft white strings in sump

[One Fish]

I was curious if anyone knows what the soft white string formations (1) are in my sump. They’ve been there for over a year and don’t seem to bother anything. They keep to the sump.

As a bonus, what are the long micro crustaceans on the glass next to the spirorbids (2)?

Neither seems to be causing any problems.

Thanks

40 Gallon LPS with 29 gallon sump
Alk 7.0
Nitrate 0.1
Phosphate 0.4

 

[tbrown]

Those look like Micro Featherduster tubes.

 

[One Fish]

Thanks. That’s good. I assume you mean the tubes on the glass. Any thoughts on the stringy stuff on the sponge filters?

 

[tbrown]

No clue on the stuff on the sponge, sorry.