Nute burn or nute deficiency?

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Canna Coco grow

What is your experience level? first grow
What type of hydro set-up are you running? Canna Coco

Your Equipment:
A) Type and wattage of lights. Solarflare 200w with supplemental cfl's to raise temp in box
B) Distance from tops? LED currently 20 in from tops
C) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...) nothing, its an LED
D) What are the bulb wattages, kelvin ratings, and schedule?
E) Is there a consistent fresh air supply? Yes
F) Do you have an exhaust fan and a circulation fan? yes and yes
G) Size of reservoir? no reservoir, it's coco

Your nutrients and water:
H) Source of water. (tap or filtered) What's it's ph? tap water ph'd to 5.5-6
I) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. Canna A&B (8ml of each per gallon) with supplemental calmag at 3ml per gallon
J) What is the ec/ppm of your unadjusted tap (or filtered) water? unknown
K) What is the ec/ppm of your nutrient solution? unknown
L) What is the temperature of your nutrient solution? (reservoir high and low temps) N/A
M) Does your ec/ppm show a rise or fall when you do your daily PPM check? N/A
N) Does the ph fluctuate? N/A
O) Do you foliar feed? If so, with what, how often, and at what time do you
spray? (Just after lights come on, just before they go out...) No
P) How often do you replace reservoir water/nutes? N/A

Your growroom:
Q) What size of closet, room or hut? wardrobe 2.5' x 3' by 6'
R) What are the temps and humidity levels while lights are on? ...With lights off? lights 24/0 with 70-75 temp and humidity 40-50
S) Have you seen signs of insects in the growroom? No
T) Are the roots long and white, or brown and slimy? Can't see in Coco

Your strain:
U) What strain are you growing? (Indica dominate or Sativa dom?) 2 Auto Mazar and 2 NL
V) Is this an photoperiod strain? Autoflower
W) From seeds or clones? from seeds

Heres a photo of the tops of my plants. The tips of the new growth have started yellowing and are pretty lime green. It started after I fed them straight ph'd water and after they dried out I gave them a very light feeding of A&B (5ml per gallon) and some calmag at 2ml per gallon to see if this would help but it hasnt. Also the stems have started going purple. I'm not quite sure if this is a defiency and I should hit em with a good feeding or just plain ph'd water to flush em. Any help would be greatly appreciated. Also don't worry about the big fan leaf in the second picture, that was affected much earlier in the grow and the problem was resolved. Thanks
 

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Looks like the start of over fertilizing.I would hold back on nutes for a week or so and just go with PH water.Dont worry about the purple stems,this is normal in some strains.
 
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