Don't trip, you will see many purple stems through its growth. As I recall see takes well to mid to high ppm feedings. Just remember that she won't stretch much after initial 12/12.
so its been just about a week now and there's a hint of purple starting to show on the outer edge of the first set of serrated leaves - is this to be expected or are the plants trying to tell me something? sorry for my apparent n00bishness :/