Yellow foam in DWC veg...HELP!

DeeWeed34

Member
I posted this in hydro forum also, wasn't sure where to get the most help.
Ok, so I have been doing rez changes every other day on three of my DWC buckets for the last week. The day after rez change, I notice a bit of yellow foam ring around the waters edge in the bucket. The Ph also keeps rising. I Ph to 5.8 every morning, by evening, it's back at 6.5, and they are not eating, the ppms either stay the same or go up a bit. Yesterday, I noticed on two of the plants, they have a little brown on the roots, wipes right off with my fingers though. Any thoughts people?
3 gal DWC
Fox Farm nutes
Ppm range - 200-300 (depending on plant)
Supplements - AquaShield and Cal mag, 1 drop in each bucket of Superthrive
Room temp - 73-77
Rez temps - 64-69

There is no signs of anything wrong from looking at them.
 
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