I not sure what this is. It’s only on the one plant. I feed it mega crop 3.5 grams per gallon. The last feeding was Friday night. I PH the to about 6.5-6.8ish. Light is at about 19-20 inches for the top. The white stuff is drywall dust that fell I wipe it all off
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Your plant looks pretty good. Do you know the pH and PPM of the runoff?