Yellow leaves

Nute burn, or lights are too close??? I am using 250 hps 10" away from plant day 20. Thanks!!!! P.S. I think it is from the light, but I just want to be sure, because I have been feeding her in small amounts. My cycle is feed, water, feed, water, rn about every (3 to 4) days. 20/4 Light cycle, with temps between (74 to 79).

Looks like nute burn... You may be over feeding them...

I'm not a soil grower but my understanding is when the plants are this young you don't need to give them a lot of food.

Cheers
- SB -

HPS for veg?

They are AUTOS. ITs all good.

they look very dark... whats your feed strength?

I'm thinking you started feeding too early.
Just give water for a couple waterings, and see if the yellowing doesn't stop, and your dark leaves get back to a normal shade of green.
I think you may be borderline to getting them hot with the light that close too, despite your temp reading.
Room temp is no indication of what the temp is at leaf height closest to the light.

I have only fed them one time with grow big 1/2 strength. It is in FFOF soil. On average I water them every 4 to 5 days, with 20 oz of ph 6.5 spring water. Very little runoff!! The strain is PKA, and they are on day 21. Thanks!!!