Is there anything above it? It almost looks like something dripped there. I've never had powdery mildew though; wish I could help there.
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They're using rockwool cubes and hand watering. Do I really have to feed every time I water? I can't do feed, feed, water? My soil girls are on a feed, water, feed, water schedule. Also how often do you think I'll have to water under 600 watt hps fixtures?