yellowing from tip inwards, nitrogen or magnesium def? pics

Sweet M

Active Member
Hi

my plant is in biobizz all mix, potted up 2 weeks before 12/12 into 11L pots, im in week 3 flowering, no nutes used until week 2 of flowering, then gave 1ml/litre biobizz bloom. 2ml/l bloom in week 3. i only water when top 2 inches of soil is dry, usually every 4 days. temps are 27 degrees Celsius lights on and 20 degrees lights off. humidity stays between 40% and 50%
Haven't fed epsom salts or biobizz grow so thinking it could be nitrogen or mag deficiency. don't check ph because I've kept it 100% organic. I use filtered water.
sorry for bad pics, don't have a camera so have to use laptop intergrated camera.
the yellowing has occured on lower leaves and a few of the mid leaves. Its starts at the very tips of the leaves then works evenly inwards, the part of the leaf which is green is a nice green, not dark green as it looks like in the picture - its just a poor camera with bad lighting.

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