Can Someone Identify This Substance?

Mork

New Member
HYDRO GROW

Strain - Sativa/Indica Strawberry Cream
# of Plants - 3
Grow Type - Hydro
Grow Stage - Flower
Setup - Recirculating DWC
Light - 600 Watt HPS
Nutrients - General Hydronponics MaxiBloom
Medium - Hydroton
PPM - 800
PH - 5.8
RH - 41% to 55%
Room Temperature -66 to 79
Solution Temperature -65 to 68
Room Square Footage - 25
Pests - None Known

Ok so my plants are not really having any issues. I am just trying to figure out what this substance is growing in my black tubes which are connected to my buckets. Is it algae?

I don't have ph or ppm fluctuations...everything stays pretty constant. I only add ph down after a reservoir change which is every 7 days. I am using Dutch Master Zone at aggresive strength. Water smells like cucumber and roots look mostly fine except where small parts of the substance are on the roots. The substance has been there pretty much all through flower (about 7 weeks now). Hydrogen Peroxide does not kill it. Comments or sugestions welcome!

Pictures:

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Strawberry Cream @ 45 days from 12/12 switch

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