Five week old with red stalk?

I have some mystery seeds that were donated, and they're now five weeks. All 6 are in my greenhouse outside under the same grow conditions, but one has developed a red stalk. Leaves look good, and the plant appears healthy. This one has been the dominate of the bunch-- the first to germinate and has been the fastest growing. Probably an unimportant fact, but what would cause a red stalk. It's the only one-- so far anyway.

Just ordered new camera, so no pics yet, sorry. Thanks for the help, an inquiring mind would like to know. Cheers!

I happen to be a new grower, so I am curious to see how this looks. Cant wait to see the pics

I know that sometimes starters will have a reddish stalk, but this went from your standard green to red-- instead of red to green. Probably nothing-- not too worried, but hoping for some shared knowledge.

Any update on that red baby 'o yours? Im curious to see whats become of her.