Thanks. I have Dark angel going as well, but it isn't as beautiful as purple kush. Yup, same company just different line. Going to finish up this grow and change to another company to get away from Scotts (since they bought GH). I'm using filtered water (as close to RO that you can get) and had to start adding 15ml of calmag because of deficiency. I have heard that GH nutes in general don't have much calmag in them. If you're using RO or near zero PPMs water, you'll want to add more calmag than what says on the bottle.