Pic of the plant first up that displayed a fade, probably calcium deficiency. Was on the edge of a cal deficiency with these autos from the start, the photo no such problem.
I've increased EC to 1.8 and have been supplementing with a calmag from the start but only in small doses. I may have to lower the base nutes and up the calmag because I think 1.8 EC may be about its limit. Light intensity to around 38DLI now on the autos and low 30s on the photo.
This one below a tad overwatered as I gave it a good dose
Below the other auto and the mutant....no problems with this auto and mutant coming along at its own pace

Mutant top pic.
Below photoperiod...no issues EC 1.5
All have been given their first runoff these last two waters since the start of the grow with high EC which is why a couple of them are looking a tad droopy from the overwater. All autos got a foliar spray of calmag supp EC 0.4 pH6.4. I probably could have gone double that.
New seedling below under well ventilated dome. EC 0.4. Its looking like stalling. I ventilated the dome on opening of the cotyledons and will remove tomorrow. Room RH is 62% 22/25 night day.

Front left mutant auto, middle and rear 2 autos, photo front right.