Trouble with diagnosis... Calcium deficiency?

I noticed a week or so ago that my Northern Lights auto has some browning spots on her. I had some initial light burn as my leds were a bit too close to her. Backed them up a bit but still noticed some browning on newer growth. After doing some research it looks like calcium deficiency but I don't know how.

I'm growing in coco I buffered with cal mag and I'm using tap water and mega crop parts a and b. Both should provide plenty of calcium.

So next I thought maybe nute lockout caused by ph problems? I'm growing six other plants using the same tap water and nute mix in different ratios and none on this same problem. Nute solution is always from 6.0 - 6.2 ph. Any help would be appreciated. Thanks.

Beezelbuz said:

So next I thought maybe nute lockout caused by ph problems?

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pic 1, that plant on the right has some serious issues. nute burn for sure. possibly nute lockout.
what EC/ppm are you feeding at?

If your talking the smaller one in the upright corner there a month old and there still only getting .6 - .7 ec nute solution/tap water mix. Ph is 6.0 - 6.2. Im about to bump her up to .8 - .9 soon as there getting big.

Any suggestions on the big NL auto in the middle with the browning leaves?

Beezelbuz said:

If your talking the smaller one in the upright corner there a month old and there still only getting .6 - .7 ec nute solution/tap water mix. Ph is 6.0 - 6.2. Im about to bump her up to .8 - .9 soon as there getting big.

Any suggestions on the big NL auto in the middle with the browning leaves?

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I wouldn't bump it up since its got nutrient burn already.
I would say that going away from tap water might help fix both problems you got here.

The big NL looks like maybe it has a disease...

Disease? Like what and how would it get a disease? I baby the fuck out of these and there are no bugs...

Beezelbuz said:

Disease? Like what and how would it get a disease? I baby the fuck out of these and there are no bugs...

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Well Its just a bit odd looking but I looked again and that looks like its a phosphorus deficiency.
Sometimes that can be locked out if your ph is too high, it is best absorbed in hydro below 5.8
I would bring down ph alittle, and up the bloom nutes

Ok I was keeping it at 6.1ish so I wouldn't lock out calcium... dropping to 5.8 won't start locking it out?
Thanks I'll do research on posphorous def