| Re: leaves folding upward
Even if you are using water cooled lights, the leaves can absorb heat and stay hot without being cooled by wind. Ambient temperature is also very important, but with a fan things aren't so bad.
If it is a deficiency it's most likely because of heat stress and not a problem with your nutrient solution... Especially using Canna nutrients.
Can you get ahold of an infrared temperature meter (leaf temp thermometer?) That would definitely help us pinpoint the issue.
Also, what is the ambient temperature in the shade- and how much air movement (wind) are they seeing?
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