Long purple stem!

IM A NEWBIE..1ST GROW N ITS ONLY DA 3rd DAY AND DA STEMS ARE BOUT A INCH N A HALF ALREDY...GOOD?BAD?NORMAL?..PLEASE HELP EASE MY MIND LOL

its normal to see.
usually purple is caused by cooler temps at night tho so keep an eye on your lights out temp by using a high low memory thermometer

i got 1..around 76º

could be due to over-watering

hope im not hijaging thread. but im curious about this same thing.. iv had a vegg. plant for about 4moths now and have yet 2 flower it(not shur sex yet eather) but the stems and stalk (about 1in thick).. is purple and its pretty damn purple.. the strain is crystal skunk(g13 lab i think) any ideas on y the purple??? could it have been the temps 2 high(around83-85)???

indoor

No its prob from the cool air at night... its fine you could turn that whole plant purple if u would like thats what I am going to be doing. Develope your own purple strain