Is this Cal mag deficiency?

Uncle Bert

Uncle Bert
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Hi Guys.
Thankyou in advance for any help or advice.
Royal Auto Gorrila
10wks old
Bio bizz light
Biobizz nutes
2ml grow, 2 ml bloom, 2ml top max, 2.5ml heaven. All per litre. Watering 4 litres every 3 days. Checked PH and its between 6.5 and 7. Biobizz light soil will buffer.
Lights 20 on 4 off
Temps between 20 and 28
Humidity ranges 45 to 60
Growing under 2, 54w optic cobs. 120 degree lenses 16 inches from canopy.
The problem has worsened the last week or so. Yellowing seems to generally developed in the centre part of the leaves. It's now accompanied by small brown spots. Some on the yellow g areas, some on their own. I have recently started to increase top max and introduced bio heaven about 3 wks ago. Seems to be still coming along but has been generally been a little slow grower all the way. Some of that is down to me stressing her. Too much light, for a few days. Odd colder night than expected in the early seedling stages, soil too wet when planted the germinated seed. She's a short bushy little lady that I've LSTd. Probably a good 3weeks till harvest best guess. What do you guys think?
 

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At ten weeks old she might be starting to winding down and yellowing and browning of leaves is showing an end to her life cycle.
 
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