Ca def or something, pls halp!

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Hi folks, first post here. Ill introduce myself and probably start a journal for my grow at some point at the weekend if I wont get too high and lazy lol. So straight to the point. My first ever grow, got some brown spots on the leaves, then yellowing, then die off. started from the bottom, the first set of leaves. First i wasnt bothered much, but its spreading quite fast so better ask. 10 girls, 5 northern lights, 4 cookies and a jack herrer, all from royal queen seeds. They are 4 weeks old today, and not happy about the size at all, looks like the grow stopped completely. Growing in 3 gal fabric pots, in a 4x8 tent. Lights are 12 x cxb3590@980 watts in total. Medium is Plagron Light Mix, nutes are AN B52 and AN Connoisseur Grow, RO water atm. Before u ask why the connoisseur, cuz it was on discount and with prime on amazon, and i dont believe all the marketing bs that its for "seasoned growers only". Ph around 5.7-5.8, TDS aroud 900, ec 1.3-1.4. Temp around 28-30 C. Humidity cant tell, my hygrometer is on its way lol. So after browsing about a good 5 hours, I reckon its calcium, or phosphorus but would be great to hear some professional opinion as well. Should you have any questions, ask. Thanks in advance, and thanks for all the info here on the forum, u all are awesome. Peace!
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edit: pics were in the middle of the text lol
 
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Thanks, yep, I`ve learnt today if ur using RO water, you should use calmag supplement. Bastard AN said that their base nutes contain all tha cal/mag what the plant needs, dont need extra. Live and learn, anyways my calmag should come tomorrow morning, hope it will help.
 
It`s around 900, getting full strength of B52 and about half strength base nutes, maybe a bit more.
 
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