White strings / Slime in Sump

[LittleJack]

first my measurements from today:

Alk: 8.1
Salinity: 1.024
PH 7.80 - 8.10
NO3: 3 ppm
PO4: 0.11
CA: 460
Temp: 79.5 F
ORP: 274
Tanksize: 100 G

Can you guys identify what grows in my sump. I recently used Chemiclean to take care about my red slime algae. Very successful. I changed a lot of water.
Still this slime is growing. But only in the sump so far.

 

[mcgyvr]

That is just bacterial snot...Are you carbon dosing?.
Its just an excess of bacteria though...Harmless..

 

[moondoggy4]

I used Dr Tims waste Away to get rid of mine, I had two tanks that had it real bad.