I have never done a coco grow, Hydro is my thing. Looks like you have all the basics covered. The only thing I didnt see, and might have missed, is a fan for circulation inside of tent. Actually if not doing already you should have a "slight" breeze on them right now to strengthen their stems up. As far as Tap water, I use tap and it is "city" water. Get a ppm/ec tester and find out what your tap water reads at. If you have a hard water issue you might learn what Calmag is real quick :weedpoke: