my seedlings got purple stems ,????

my first grow in hydro sys,is that normal?the leaves are real green,but they look like theyre lazy not sick,

purple stems on seedlings is natural

thx man,was wondering if i had a problem ,preciate that.

one of my first (unsuccessful) grows i had 3 little plants all started from seeds from the same bud and one had a purpleish stem and the other 2 did not. im not sure what the cause is, but it is normal. good lich on your grow bruddah