Plants are 3 weeks and 3 days from sprout, grown in happy frog, ocean forest and perlite all equal parts. I have givin them zero nutes and watered one every 3 days with tap water ph'd to 6.3. A week to 10 days ago this started and has done nothng but gotten worse. Temp and humidity is a constant 78 degrees and 40%. Any help would be greatly appreciated, thanks in advance.
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