not sure if I'm having a lock out or a deficiency. They are in day 27 of flowering. I have been using tap water with these specifications: http://waterandsewer.org/wp-content/uploads/2017/03/Water-Quality-Report-2017.pdf I ph tested the water with the droplets ph up and down kit before feeding and it looked to be 6.5-7 I have been feeding with neptunes harvest tomato and veg 2-4-2 throughout the grow and roots organic hpk 0-4-3 since I started flowering . I use hpk every other watering and neptunes harvest every other so hpk-water-hpk-water-neptunes-water-hpk-water and so on. Last couple weeks though I just began using only the neptunes since the first few weeks of flower is stretching. I'm in a 4x6.5 grow tent with exhaust at 300cfm and venting outside and passive intake from an air conditioned room. I also have a 6inch clip on fan blowing constantly on high. I'm using a 600w hps light with adjust a wing reflector I just gave it a nice epsom salt foliar feed last night and sprinkled dolomite lime on top today. I used the dolomite lime a couple times throughout the grow. Today I watered with 1 teaspoon of epsom salt a gallon. It looked like mag deficiency cuz there is brown spots on some leaves. I'm not sure what is going on I'm basically thinking about just giving them a nice flush even though I did that epsom salt feeding. I feel like that was a bad idea. Some leaves have brown ends about 1/2inch in and on the sides and some spots. All 3 plants are pretty tall almost 4- 5 feet each. Please help ASAP not sure what I should do and I want these plants to live and grow a lot more bud!