You're in good hands here but take it easy with that light, no need to add any extra stress until the problem is resolved. Personally I'd transplant the problem plant into a slightly larger container with plenty of perlite and regular soil to make sure the roots aren't suffocating. Wait and see what Rusty (or other more experienced growers) says about this before doing it.

Any way of measuring the run-off ph? If using the color strips or drops, tinted run-off will skew the results. Need a digital ph pen for that. Hope you get it figured out :jointsmile:
bigtopsfinn Reviewed by bigtopsfinn on . black spot, shadow Hi to everybody My name is Dan i have a problem with my 3 week old plants. I grow them under 600hps, 12inch from a lamp. I had a small deficiency of N few days ago, but that problem was sorted. Ph of soil is 7, water between 6-7 (do my best to reach 6.5). there was a problem with humidity so started spraying leaves with water for a night. I did it every night and started 3 days ago. I sprayed the well with a water. Today morning one plant got some black shadows/spots on bottom leaves. Rating: 5