RQS - Northern Light & Purple Queen

Time for another update, these two have really progressed in the past week or so, really bushing out a lot more now. Its week 6ish depending on how you count it, from the day it sprouted or day I planted the seed? Not sure when it germinated as it was below ground! I started LSTing them both partly to encourage them to fill out the tent a bit more but also just for fun and to experiment a little as it's my first ever grow. The only thing that concerns me is the node spacing is very very short. Is this a problem? Genetics? Light too powerful? I only have it on veg mode at the moment. Have a look and see what you think. Other than that everything's going well, they are looking healthy and are drinking a lot more now, watering multiple times a week. Just broke my PH pen, doh! Another one is on the way, I just hope I dont need to ph my water again before it arrives! peace