Geez I am remember planting seeds just after you and my 2 DFGs are dwarfed when comparing. But I am growing outside with temps 18-25c daily now and they get only 3 hours direct sun. Looking at your pics, your lights must be very powerful as I see heat stress evident in the leaves.
Using a 400 watt HPS 24-7. The leaf is curling more than likely because I'm pushing the nutes a little too early for C3 & C4 my temps are 65-75F. 3 Hours is some slim light but you should be getting more and more I'd like to see what the Cobras do outside since they are geared to single cola I thought that they would be mainly for indoor.
I'm getting some T5 supplemental lighting Single 2 ft bulbs up; hopefully the blue spectrum will get my camera to freakout less. I could at least turn off the HPS and snap picks with T5 lights.
Fed the Dr and C1 full strength bio bizz grow. C1 is dry and hungry and the DR too a lesser degree. C3 and C4 both show leaf edges curling up and their dirt is not drying out as fast. I have a feeling if I give them a couple days to chill they will do great. Forgot to check C4 for sex...maybe tomorrow.
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