3 RQS Autos (First grow)

This week has been good, all of the plants are starting to look great (Although the skunk is rather small) I've been upping the amount of bloom nutrient each time I feed the plants, but can't seem to stop purple stems from appearing, so bloom nutrient is now increased to 2ml/l I've run out of room to adjust the distance from the tallest plant (Northern Light Auto) to the grow light, hopefully, the plants vertical growth will slow down soon. The other 2 plants are shorter (a lot shorter for the skunk) so they are sitting on top of cardboard boxes inside the tent in order to give each of the plants equal light.