those might even be the start of roots above your rockwoolNo not powdery mildew at all
Let me take a pic and I'll post it if one of them
Ya, it doesn't seem to be effecting them at all, still growing strong
Here's a pic
This one is the worst, it's covered, noticed it last night and separated it just in case
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My 1st reaction was mold but looked around and all the pics of mold on clones I'm seeing look nothing like this