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Yeah, this is nute burn... lower the nutes under 800ppm and the problem should dissapear. White dwarf has ruderalis genetics. Most strains with a bit of ruderalis in them can't take too many nutes.

85 is the usual limit. Can't you adjust the ac in order to keep a lean 79-83 degrees? And try to keep the temps during the night over 75. Some strains with tropical origin are more sensitive when it comes to low temps.

Do you mist or spray your plants? If you keep your hand, palm up, next to the top for 1 minute, does the heat from the bulb seem pleasantly warm, but not uncomfortably hot? If the answer to these questions is YES, then this is just heat stress, in which case you need to raise the buls a...

This sounds instructive... could you explain in more detail, I'm really curious.

Go to any store with a garden department and buy one of those green pH+moisture+light meters, they're easy to find, they have 2 rods, one copper, one zinc, that you stick into the soil. This way you'll know at least if you're in the proper range. Do you actually believe that these guys test...

Growing is pretty much a hit and miss type of activity, so... Turn off the ac for a 2-4 nights. If the problem doesn't advance, it was simply the cold, if it does, it's P def.

I can barely tell, but I think it's N toxicity. Are the leaves as well as the veins dark green? Do they feel smooth, heavy, leathery? If it's not that, then it's the start of a P def. In this case the edges would start to turn brown, something you havn't mentioned, so P def is probably not it...

Never tried the Jack Herer from GHS, but I'm a big fan of Alaskan Ice and White Rhino. Since Alaskan Ice is pretty new, it's not completly stable, I've noticed that 1 out of 10 plants will be lanky, with little side growth and a very tiny yeald. But the other 9 out of 10 grow into some of the...

Flush, wait for the soil to dry, then water again with cal-mag. CO2 raises room temperature and stems and leaves tend to droop in warmer conditions. The plant thinks the sun may be shining too much and is reducing the total leaf area on which the light shines in order to minimize any imminent...

No, this is definitly not a mag def. It's nute lock out due to a pH problem. Check your soil's pH and make sure it's in the proper range.

Hmm... Your mother plant shows signs of N toxicity, underwatering or root problems. The little ones could be affected by a pH lock out. Around 6 is not necessarily good... as far as I know (althou I'm not a hydro guy) 6 is pretty much the upper limit. You might want to lower the pH abit. If...

Well, you should feel safe and secure with the choice you make. Cal-mag will fix the problem if it is mag def. PS: I never mind being wrong as long as it isn't at the expence of a plant...

No, P def doesn't cause all out purpling, just one or two big spots. Purpling like this is usually caused by low night temps.

The edges seem a bit raised. This is a sign of either a pH problem or high temps. I think your pH is a tad too high for hydro... Some growers go overboard with feeding, so their plants suffer from N toxicity... that's what's causing some plants to look much too dark green. The light green of...

Most growers seem to prefer tiger bloom... they must know what they're talking about.

P def. Shouldn't have flushed. Raise the nute concentration. I hope you have some good flowering nutes.

I would have also said spider mites, but these details made me reconsider: Spider mites attack new leaves too, but in a cal def, because calcium is mobile, new growth remains unaffected.

The roots didn't take or they can't reach the nutes...

pics please...

It's a calcium deficiency. Cal-mag or molasses (2tbs/gal) will fix it.