Hi people long time reader of your awesome forum. I have an issue which has stumped me, iv'e been growing for 8 years on and off. And have grown with my below setup twice before successfully. Find below an image of a some what small 3 week old plant. New growth is lime green and i have no idea why. At 1st i thought mag or sulpher but have discounted both through diagnoses. I think this is Iron but im not sure and im stumped why. I foolishly added 3ml of calmag by mistake into last weeks rez, wonder if i have a lockout? The only item i have upgraded is my pump and air stones. Been having a dig around google and apparently larger pumps and new air stones can induce iron def? Any help would be much appreciated.
A) Light 180w led
B) Distance from tops? 16inch
D) What are the bulb wattages, kelvin ratings, and schedule? Pro grow duel spectrum. 20/4
E) Is there a consistent fresh air supply? every hour.
F) Do you have an exhaust fan and a circulation fan? yes
G) Size of reservoir? 18ltr sdwc
Your nutrients and water:
H) ph 5.5 let it rise to 5.9 then lower.
I) Nutients: using vitalink max, Rhizotonic 20ml, Silica 3ml.
J) What is the ec/ppm of your unadjusted tap (or filtered) water? 0.2 Bottled.
K) What is the ec/ppm of your nutrient solution? 0.5 all in.
L) What is the temperature of your nutrient solution? 23c/25c
M) Does your ec/ppm show a rise or fall when you do your daily PPM check? Not yet with this grow
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...) Nope.
P) How often do you replace reservoir water/nutes? Once a week
Your growroom:
Q) What size of closet, room or hut? 4ft square.
R) What are the temps and humidity levels while lights are on? Humidity 40/60%. Temp 27c For both day and night.
S) Have you seen signs of insects in the growroom? Nope.
T) Are the roots long and white, or brown and slimy? Long white.
Your strain:
U) What strain are you growing? (Indica dominate or Sativa dom?) AutoXetream Dutch passion.
V) Is this an photoperiod strain? Auto.
A) Light 180w led
B) Distance from tops? 16inch
D) What are the bulb wattages, kelvin ratings, and schedule? Pro grow duel spectrum. 20/4
E) Is there a consistent fresh air supply? every hour.
F) Do you have an exhaust fan and a circulation fan? yes
G) Size of reservoir? 18ltr sdwc
Your nutrients and water:
H) ph 5.5 let it rise to 5.9 then lower.
I) Nutients: using vitalink max, Rhizotonic 20ml, Silica 3ml.
J) What is the ec/ppm of your unadjusted tap (or filtered) water? 0.2 Bottled.
K) What is the ec/ppm of your nutrient solution? 0.5 all in.
L) What is the temperature of your nutrient solution? 23c/25c
M) Does your ec/ppm show a rise or fall when you do your daily PPM check? Not yet with this grow
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...) Nope.
P) How often do you replace reservoir water/nutes? Once a week
Your growroom:
Q) What size of closet, room or hut? 4ft square.
R) What are the temps and humidity levels while lights are on? Humidity 40/60%. Temp 27c For both day and night.
S) Have you seen signs of insects in the growroom? Nope.
T) Are the roots long and white, or brown and slimy? Long white.
Your strain:
U) What strain are you growing? (Indica dominate or Sativa dom?) AutoXetream Dutch passion.
V) Is this an photoperiod strain? Auto.
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A lot of autos can take higher than 1.0 EC especially towards flowering. I start them off at 0.8 for week 1, week 2 is 1.0 and week 3 either 1.0 with stronger nutes or 1.2 with the same baby feed. That's why 0.5 EC sounds low to me 
You could try upping the EC to 0.7 just to see if it benefits your girl at all? I'm not sure what the remedy is for Iron def off the top of my head but there is a chart or all deficiencies on this forum so I'll go have a gander 
