A slime like substance?

[brianinak]

so, a few days ago I noticed a string like structure coming out of the pores of my filter sock (red sea Mesh 200).  I went to grab it to feel it and see if had a source and it was imposible to hold in hand, thing like water.  Would try to grab a get nothing.  Almost looks like white snot, but less thing. 

 

So changed filter sock.  A few day later, same thing again. 

The picture is of it consolidated, it is not just bubbles

when sock left alone it begins to slip out of the pores, imaging a bunch of individual spider threads coming through tiny pores of the bag.  Any ideas let me know

 

Water params fine, no issues there. 

[brianinak]

change my socks about every 4-5 days.  Rinse with hot tap water to get junk out.  Run through hot water wash in washing machine.  Dry for several days before using again.

 

I did phosguard in sock about 5 days prior to noticing it.  Threw away when I saw the slime like stuff and changed sock. 

Been winning battle with cyano, not sure if relevant or not.  Skimmate light tea color

 

Curious what you guys think.