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New Growth Yellowing Slightly

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Good evening fellow growers....I have 4 lovely plants going strong...they are 5 weeks old...but for the last week or so...one of the plants is showing some yellowing on the leaves of new growth. I have done all the research...The PH of watering water is well controlled between 5.5 and 6.....the plants are growing in coco soil...and are getting nutrients in the watering water. I have read that this could be an iron deficiency...however all plants are getting the same water and nutrients and only 1 or 2 are showing this. Any suggestions or any grower out there who has had a similar experience....please help ...your suggestions would be most appreciated. Other than this slight yellowing symptom...plants are very healthy
 

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They still look green to me - any calcium/magnesium supplement in your nutes? If not, then something like CaliMagic will make them greener.
Other than they they do indeed look good. Autoflowers?
 
Hello Canuck.....someone said that Epsom salts would do for the Magnesium/calcium possible shortage..or do you think this a little crude...?....no not autos...they are VIP Amnesia.....
 
Your plants look nice to me too.
Any time your using coco, you need to add a little cal-mag, I grow in soil an use tap water, but I still use 2-3mls,of cal-mag, most waterings.
You can always add a little more Nitrogen, if it needed.
Plus all plants don't always grow the same, some like more nutrients, some dont.
But your doing a good job of looking after them, and I think you will be fine.
HappyGrowing
 
Epsom salts does not have any Calcium, but provides Sulfer which the plant uses in flower, so I don't usually add it (optional) until mid flower.
 
I take 20 egg shells and boil them in 1 gallon of water for 20 minutes, the strain (top up to 1 gallon) and add 1 tablespoon epsom salt (foliage spray), then add 1 tablespoon black strap molasses and water them I am in soil,,,
 
I am a little confused now as to what to do add to my nutes for the plant that is producing slightly yellow new growth, similar to the one in your pic. At the risk of being boring, here is my nute schedule :
​​​​​​

Nutrient A Contains:

Nitrogen N 66g/kg

Phosphorus P 45g/kg

Potassium K 239g/kg

Magnesium Mg 45g/kg

Sulphur S 71g/kg

Trace Elements:

Iron Fe 1700 mg/kg

Manganese Mn 400mg/kg

Boron B 500mg/kg

Zinc Zn 200mg/kg

Molybdenum Mo 50mg/kg

Copper (Cu) 30mg/kg

Nutrient B Contains:

Nitrogen N 155g/kg

Calcium Ca 190g/kg

Is there anything that I can add to achieve the remarkable turnaround that you made on the plant you posted pics of...is there anything that i am missing here...?
 
The nutrients look fine, the addition to the Cal/Mag as mentioned above is a good idea.
What lights are you running- include distances and schedule?
 
Using CFL;s......200 W......6400K...one light for each plant....as close as i can get them without too much heat on plants...say around 2 to 3 inches above plants..and I have them on a 21/3 schedule...plants are 6 week old now
 
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