Autopilot xxl grow

[Bignugz420]

Hi, I need some help.
these autopilot xxl babies are 17 days old from sprout.
they grow up pretty slow, and seems to have some yellowish leaves color.
Both are about 40-45 cm away from an 400w HPS light.
In soil, getting only water. Temperature is good, but humidity is pretty low, about 35%, though I'm using a humidifier plus wet towels.
What should I fix in my setup?

Your pH looks to be outta wack. I would pH water flush then test run off and then feed at right pH. ThstsT what I would do

[Hamjam187]

What is soil you are using? Hopefully something Good (hate m-grow) w fox farms you shouldn’t have to add nutrients for first month or so. 400w hps at 45cm seems close, those lights do put off a lot of heat. I would go a little less then double that like 75 maybe. I’ve seen good yields in really hot rooms but to much light can be a disaster to plants, doesn’t hurt to have autos stretch toward the light at first anyway.
I would say to make sure your water is ph’ed and soil has nutes it needs.

[MagicOr]

Thanks for your input.
I do need to work on my PH levels, just fixed that.
I'm using a good soil, but maybe it's not rich enough, so I just started feeding with Biobiz nutrition for vegetation stage.

however, I still did not figure out what is the appropriate distance from the lights. When putting the plans about 60-70 cm away, they seemed to be drooping. At 3rd week from seeds spraut, what is the best for autos?

[D.A.A.S.69]

12-14inches, is what Nebula says, autos or photos know differently, same distance is fine. As long as you got good air movement.

[MagicOr]

Many thanks. Hopefully I will have some good news soon.

[Redwasp]

Dont knock autos. I just had one finish in 9 weeks. Unbelievable yields. I have both and can tell you for the time spent what you get is really worth it.

[Hamjam187]

They are definitely high yielding plants that’s for sure.

[Cows]

Are they hard to grow?

[Redwasp]

Not hard at all.

[MagicOr]

Guys, how soon should I see an improvement after fixing a nutrition deficiency?