Help, my plants are getting sick and I can't figure out what it is

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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

Hey everyone, thanks for reading. It's week 4 and I know my plants are small because for some reason they just didn't wanna grow the first 10 days but then they took off but now I have a new problem. I can't tell if it's a calmag deficiency or nute burn. At first I thought it was a deficiency but now I think it may be nute burn but online pictures all look so similar and I don't wanna flush or feed before I get a second opinion. It started off not too bad but it's starting to get way worse, the odd thing is out of 4 plants it's only affecting 3 and the one that isn't affected is the smallest one which could mean it is a deficiency because the smaller one doesnt need as much food yet so it isnt affected?Here's a link https://www.autoflower.org/f44/first-grow-2-x-auto-mazar-2-x-nl-auto-25948.html to the grow and hopefully this problem can be stopped before it gets any worse. Pics below

sick1.jpgsick2.jpgsick3.jpg
 
Looks like cal/mag to me and they look a bit hugry too..up the cal/mag or foliar spary 1/4 tsp to a spray bottle for faster action!:smokebuds:the last pick im not sure ..could be bugs! :(
 
Looks like cal/mag to me too. I would follow the advice DABaracuss gave you and think you will see much healthier grow from here forward. You probably already know damaged leaves do not heal. Good luck, coco isn't the easiest to start with, but you have clearly done some research, you'll get it sorted out in plenty of time for some Xmas buds.
https://www.autoflower.org/members/dabaracuss.html
 
Thanks DABaracuss and kryptogreen for the help, that takes a lot of stress off me for what to do. I'm gonna give em a nice feed tonight with some extra calmag and foliar spray some calmag on to hit em right away. I haven't seen any bugs in my grow room and it's only on the one plant but is there something I can do for that plant or should I just try the calmag on it?
 
I would just do exactly as DABaracuss advised. IMO you don't have bugs unless you see them, so unless sighted don't treat for them.
 
Sorry forgot to mention to you that nute burn with show at the leaf tips. When you see this, just back off a bit with the nutes.
 
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