Marijuana seedling purple on the bottom

I just began to grow a marijuana plant like 1 week ago and the stem and under the 2 leaves are purple. The plant also curls its leaves up in the day time and opens in the night. Is this bad? This is my first time doing this obviously

Reddish stems on seedlings is a strain trait. Drooping when the lights are on usually means a heat problem.

It doesn't droop, the 2 beginning leaves of when it's first growing are like, closing in together upward. and in the night it looks pretty normal except for the fact the stem is purple.

i was told purp stem is when its cold...and my leaves bent up with the light...wish means your probably givin it to much...take light a little further just a little not much...im a first time grower aswell..happy growin!

thanks, cheers to you