What is your experience level? experienced

Your Equipment:
.1) Type and wattage of lights. HPS 1000 watts 62.5 wpsf 30-40k Lpsm
.2) Distance from tops? 20-24
.3) Reflector type? enclosed reflector
.4) Is there a consistent fresh air supply? closed enviroment 1000ppm co2
.5) Do you have an exhaust fan and a circulation fan?no exhaust lots of cirrculating
.6) What are the bulb wattages, kelvin ratings, and schedule? 1000w horti's all brand new

Your medium:
.7) hydroton
.8) Size of container. 2.5 gal greentrees multiflow
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? rapid rooters

Your nutrients and water:
10) Source of water? filtered RO What's it's ph before adjusting? 7
11) Method of checking water ph. ph pen hanna 98129 new probe and calibrated
12) Method of adjusting water ph. phosphoric acid PH Up
13) Specific brand and N-P-K ratio for each bottle. List dosages and current feeding schedule. Advanced 2 part, 3 seperate rooms in various stages of veg 1.1200ppm, 2.1400ppm, 3.1500ppm
14) How often are you watering between feedings, and how much per watering? watered every 4 hours 15 mins
15) Any additives or tea's?humic,fulvic,bacteria(orgeonisum),potassium silicante
16) Are your ph levels stable, or do they fluctuate? I set it at 5.8 I check on the plants every 2 days and it is 6.2 when I come back
17) What is your ingoing water's ph? ...your runoff ph? n/a
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? 1st time today 1/2 teaspoon per gallon epsom salt 2 hours before lights came back on

Your growroom:
19) Indoors or outdoors? indoor
20) What size of closet, room or hut? 3 20 x 8 storage containers
21) What are the temps and humidity levels while lights are on? ...With lights off? I have 9 tons of cooling so the room is always constant I run them at 80 humidity has been low latley around 35
22) Have you seen signs of insects in the growroom? none

Your strain:
23) What strain are you growing? unknown gifted kush that we have grown before
24) From seeds or clones? clone
25) Is this an autoflower strain? no
I have grown this strain out several times and have never had any deficiencies it is a real heavy feeder topping out at 2000 ppm's around week 6 of flower. Now latley I have been getting this.(pic below) It appears to be a Mg problem. My ph is normal. my ppm's are right on track. I have never needed cal mag before. Anyways what do you guys think?

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Here is a few shots of the place.

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