Yellowing leafs (image)

Using peat based soil and watering with ph perfect bloom, 600 watt hps.
Had 1 plant turn a little yellow During mid flower last grow but this one is turning a week into flower
 
A picture under white light not grow lights would help narrow down the nutrient culprits. The colors will be more true to determine the type of chlorosis. Cant see reds or green hues in current grow lights.
Usual suspects calcium, magnesium, potassium, nitrogen.
In that pic I see primary magnesium deficiency, not likely iron and some nitrogen deficiency.
 
Definitely a deficiency of some type. Hard to narrow down exactly what it is with the limited amount of information provided. Try to be as specific as you possibly can, and not give a basic run down of what you’ve done to this point. The more information you give the better these guys will be able to point you in the right direction. Don’t forget to mention whether it’s an auto or photo.
 
Plants were fine when I got em couple weeks age feeding with 4ml advanced nutes bloom to 2 litres of water and soil is peat based
 
Dolomite. Peat soils tend to run acidic and unless its a premium soil lacking in cannabis minerals needs.
 
Very little growing experience, would they turn yellow if there to dry?
 

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