Yellowing veins

I can't get a straight answer off searching. Thought I would post it here. I think my ph is too high so I'll be going out to buy ph down tomorrow. If I get another suggestion here that would help.

1000w mh about 30" away but dimmed to 600w
Temps have hit 30 but usually 25-26
Humidity is usually between 45-60 but it went down to 20 when my res ran dry on it overnight
Soil 50% pro mix, 25% perlite, 25% worm/mushroom
Seedlings are about 17 days from germ

Oh and I've fed it with 1/4 strength nutes twice now. But I'm pretty confident it's not over freeing. However I'm a newb so correct me if I'm wrong.

And it's only on about half of the plants. About 5 out of 10.

Hi Boomy,
I would try and transplant them into bigger pots, I have that problem when the roots start to reach them white sides of your solo cup try it and see if it helps your yellowing in the veins, I am sure it will. Keep us posted, and good luck

I wouldn't be too concerned with it at this point. Just transplant.

Bear420 said:

Hi Boomy,
I would try and transplant them into bigger pots, I have that problem when the roots start to reach them white sides of your solo cup try it and see if it helps your yellowing in the veins, I am sure it will. Keep us posted, and good luck

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I'm having the exact same problem with mine but my plant is only 8 days old so I don't think she would already need to be transplanted but I'm new at this so I don't know. Should I transplant her?
She did somehow get planted on the side by my boyfriend so I don't know if that could be causing a problem? I have already transplanted her once to get her into different soil so haven't wanted to do it again cause I know it can be stressful but want to do whatever is going to be best for her. Suggestions?

Shiann your plant looks good for what you described and if you transplanted there is generally a few days stall. But I'm wondering what you have it planted in. Is there drainage holes in the bottom?

MeJuana said:

Shiann your plant looks good for what you described and if you transplanted there is generally a few days stall. But I'm wondering what you have it planted in. Is there drainage holes in the bottom?

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She is planted in a solo cup and yes there are drainage holes and it has been draining great. I transplanted her to new soil a couple of days ago and she has had a lot of growth since then but the veins in her first true leaves just barley started turning yellow yesterday

She's too freshly transplanted to decide there's a deficiency if the yellowing continues back her off from the light while she gets new feet

Shiann said:

She is planted in a solo cup and yes there are drainage holes and it has been draining great. I transplanted her to new soil a couple of days ago and she has had a lot of growth since then but the veins in her first true leaves just barley started turning yellow yesterday

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Yes just give her a few days to recoup, don't over water her.
she does look pretty good all in all.
it may just be transplant shock, so give it a few days.
Good Luck

Okay I will just wait a little bit to see whhat happens. Thanks for the feedback