Need some help not sure if its serious or not PURPLE LEAVES???

Alright here are the specs my seedlings are 7 days old growing pretty nicely I have a few strains going Jack Herer, Sour Kush, Vanilla Kush and AK-48... Most of my seedlings look great but some have the 2nd set of leaves a DEEP PURPLE COLOR and it seems to be slowly showing up on other seedlings JACK HERER are the deepest purple and 1st to show... What could be causing this issue? I have an intake sucking in fresh air, and exhaust blowing out old air and the temp stays between 75-80F... I am running under a 600W Metal Halide Conversion Bulb which is approximately 2 1/2 feet above the plants pics of a healthy not purple plant and one of the purple ones are shown below PLEASE HELP AS I AM TRYING TO FIX THIS ISSUE ASAP! PHOTO SHOWS ONE OF THE PURPLE ONES AND ONE OF THE HEALTHY SEEDLINGS please help so I can fix the issue!

photos are pretty close up but you can see the difference I just don't want to kill the plants so any help will be appreciated

my PE looked the exact same way when they sprouted but turned green over time wouldnt worry

I didnt know if it was some sort of mildew or mold or fungus of some type they didnt start out this way kind of turned to it and where it looks like other plants are turning now had me concerned

I had some Bahia Blackhead sprouts that looked the same way. The new growth stayed light purple through veg, but the leaves got dark green as they got larger.

alright hopefully thats all this is and it's just some weird coloration which will eventually go away and get a nice green color! I have had a few other grows but this is the 1st time I have ever seen anything like this on my seedlings so I figured I'd ask and be safe instead of not ask and lose my grow. If anyone else has any input let me know thanks!

Wouldnt stress it happens sometimes for some plants to have a slight purple tinge early on. My best guesse is that when she is a bit older and bigger leaves, you will see on the edges of the leaves a slight purple tinge aswell. Take care of your girls tho, and they'l take care of you.

I guess it makes sense I'm just glad it's nothing major I will keep monitoring the situation and hopefully it's just a tinge on the plant

thanks everyone for all the help it is appreciated! If anyone has any other input it is appreciated as well!

does it look different under sunlight?

...even the dirt looks purple

the plant looks purple outside of the grow box the photo is not the best quality photo but the plant looks that color no matter where it is LOL

okay...i was just checking. xD

should be fine.

thanks a ton I'm glad the general opinion of everyone is they should be fine makes me feel alot more at ease!

I wouldn't worry about it, they seem to look healthy. Just keep a close eye on them. I keep an journal on everything that goes on. That way you can compare notes on day to day activity.

It could just be in the genetics.....