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thrips?

Dotted lines show what works together. Solid line represents ones that don't play well. Too much cal or potassium can antagonize mag

Botanicare uses calcium nitrate it their calmag. GH uses calcium carbonate it their's. If you use pH down you do not want to use carbonates as phosphoric acid burns off carbonates. Calcium carbonate is mainly used to help with acidic soil conditions. It is important to note that "calmag"...

It was probably just slightly underfed during the stretch so it started to cannibalize itself a bit. Overall, plant looks good to me. I wouldn't go changing too much. You've gotten her this far just watch if the symptoms persist

Maybe but it is not set in stone that you must use cal/mag just because you use RO water. I don't use it with Dyna Gro and don't have any problems. But thats a complete fertilizer.

No it doesn't.

Hell, use all 3. However keeping your tamps down is going to be one of your biggest issues. The leds helps here a little as well as using less wattage. Even running 3 mars lights you'd be at roughly 420 watts opposed to 600.

Using that many bulbs should spread the output decently right off the bat. As far as focusing goes I don't think you going to accomplish it with what you've taken off your tv.

I would probably still want to add another Mars light in there, they are cheap enough. How big is the closet?

I think you might be shooting yourself in the foot. It may defuse the light but at the cost of efficiency. You're losing overall output to defuse the light... normal hoods actually work pretty well

The Mars lights you have run at 140 watts, I have a few myself and I like them. Will they put out the same amount light intensity as the 600 watt hps? No. But they are still great little lights for propagation and veg. They off better efficiency and better spectrum as well. Get two more and...

If you're using a complete fertilizer there is no reason to use calmag.

The reason being the GH Flora series is already balanced, especially at equal parts of grow, micro and bloom. Grow and bloom have the mag and micro has plenty of calcium. And those are better balanced ratios of cal and mag. Using calmag when not needed can throw off this ratio and cal and mag...

Why so much CalMag? I would cut it back, if not eliminate its use all together. Using RO water?

Maybe prune the worst ones

When I read it sounded like you were first over watering then you let them dry out. Either way, you should always water till runoff, 30% is a good minimum. I doubt its anything you did recently as its on the somewhat older or middle of the plant, new growth looks good. So keep doing what you've...

You might have figured your problem out already. You thought you were overwatering, this can cause calcium deficiency. Only see the problem spots on the older, lower growth? The new growth looks good.

First bit of advice I'd give is to ditch the CFL's and get a better lighting setup. As to the nutrients... does the one actually say to repeat at fortnightly intervals? What the hell is a fortnight?

I have a couple Mars 300's I bought off ebay just to try. Price is good and overall I'm pretty impressed by them.