A few weeks in and so it begins...

Hiyall
Got 2 young girls (5 + 2 weeks) in DWC and i noticed some signs of something yesterday.
AK49 Auto, 2 weeks, DWC, pH ok, 420ppm in the bucket, weird gray spots...any ideas what this is?

Then the other girl, Sour Diesel auto, DWC, pH ok, ppm dropped from 400 to 300 which tells me shes feeding, but i hate these things which could be a million things!

Many thanks!

The Ak got worse overnight. Leaves curling up. Ppm rose from 415 to 440, that tells me she's not feeding right, it also suggests it's some kind of nute burn...but it doesn't look like normal nute burn to me...?

Thanks!