Need some help on my second grow.


I'm growing White widow auto and skywalker og auto from barney's farm.

Started off in peat pellets then transplanted (popped peat pellet into final pot) 5 gallon smart pot without disturbing roots.

Growing in coco eco thrive with 1% charge and 20% perlite.

Under viparspectra xs2000 lighting on 75% at 70cm height 20 / 4 light cycle.

I'm using RO water and getting my ph between 5.8 and 6.0.

2 oscillating fans on timers.

Day temps 24C, humidity 60 to 65%. Night 18C and humidity 55 to 60%. Leaf temp - 2 to 3 and my VPD is between 0.5 and 0.8 and as you can see from pics I'm able to keep my climate very steady.

First week just pH 6.0 water and second week i started nutes following Dutchmans AN Auto flower feed schedule. That recommended first week EC 0.5 i started at 0.3 to be safe. Nutes are advanced nutrients sensi coco grow. Today is day 15 from sprouting.

I've been very careful with watering as my last grow the white widow showed signs of over watering and looked limp. Still turned out great in the end. So this time I'm just watering around the seedlings and letting top 3 to 4 inches get dry, pot weight still feels like it's holding some water though but very dry at the top. Seedlings are still showing signs of been over watered even when i leave them for 2 days to dry out. I then questioned could i be wrong and they are under watered so on one fertigation i made sure i got a little water near the stem. Yep further wilting so I'm back to thinking over watered or could it possibly be nutrient lockout?

I've only fed 3 times but never to run off as was of course worried about over watering. I tried little and often to keep coco moist to prevent this so i cannot think of anything else it could be.

How do you water to run off without over watering?

Does this look like nutrient lockout?

Any advice where i could be going wrong will really be appreciated. TIA.