Ross....great post! I'll only add one more guess because no photos.....possibly rootbound?
Weedhound Reviewed by Weedhound on . Curling down leaves The setup: 3 plants I am using 200w envirolites (veg), using tap water every other day. The lights are about 4cm away from the plants. The plants have been under the light since 20th feb. I have transplanted it once. The nutrients I have been using Plagron Alga grow once a week. Started using nutes 2 weeks ago The soil, miracle grow (only soil I could get) Looking to flower asap. The problem: The leafs on all the plants are curling down + maybe a little dry. The lower set of leaves have Rating: 5