I had the same situation of your plant and i was using 2 cfl of 100W each.
When i have approximated the plants to the lights they got curly upward. Sometimes the temps seems ok but if the plants is too close to the lamps could happen this. Mostly of the people say that CFL doesn't burn, cold...
You have got a Salt Built Up. What you've got to do is periodic flush and stop feeding. Change the whole water.
I'm not a hydro expert actualy i'm use to grow in soil but i almost 100% sure that this is excess of feed accumulating.
Best Regards
For me the first 3 weeks i go for CFL lights. I use 4 bulb of 90 w each making 360w. I tested MH x CFL for seedling and its definitely the CFL is better for this phase. The leaves grows faster in CFL lights than MH for the first few weeks. After that i go for MH light. It has the best spectrum...
25% of perlite
25% of Sphagnum
25% of vermiculite
25% of humus
i have used this kind of soil mix and always gave me good results. Remember only that you´ll need to feed them after the seedling phase. I advice organic feed like bio canna or bio bizz.
hope...
Hello pan , i´m new here in 420mag. I just started a new crop of SLH and i´m in seedling stage but the leaves are not ok. The leaves seems to be to dry turning to a white and becoming dry and dry. First i left 1 week in the CFL and then i have moved the plants to the veg room and the plants...