14 days flowering turning yellow

Hi

photos below. 14 days in flowering. Growing in coco, nutes Canna coco A/B only, PH 5.8 - 6.3. Flowering with 400W HPS. Temps: Lights on: 30C (86F), Lights off: 22C (72F) Haven`t changed anything in feeding since flowering started 14 days ago. Any opinions? What is up with these leaves? I think it`s spreading....

As Rollitup photo uploads don`t work, below photo links:

http://imageshack.com/a/img923/6840/eVrvII.jpg
http://imageshack.com/a/img923/8729/G5e0L6.jpg

Thanks for opinions!

* also hand watering every other day with Canna A / B: 2 ml / 1L . Usually no runoff

Cal-mag

Not calmag they are probably hungry...

Id say give them more food. id be easier to tell with a picture.

Needs repotting now to reduce the leaf yellowing/drop ,it would be rootbound and stressing and nneding to take up more K.
Only watering for the first week after re potting.
Try canna terra coco and nutes next time and plan to have it in a bigger pot by this stage.

IMHO, I would suggest that you foliar feed with 50 ppm micros, 300 ppm NPK (1:1:2 ratio), and about 50 ppm urea for one liter of spray, Add about 2 grams of glucose ( Corn syrup / sugar) to the mix - it will retain the H2O and spray intermittently. When the leaves return to their deeper green colour, spray with plain water to rinse them, pH it to around 6 for the application,

The Micros will balance out the nutes and limit the absorption of any one nute. The nitrogen will allow the plant to increase protein production, Phosphorus will provide the energy, and potassium will regulate ion transfer and osmotic pressure. Urea is readily absorbed, and will carry other nutes with it. The sugar will retain the moisture for an increased duration of nute absorption, If you want to really push the absorption, add humic acids in small quantities, say one or two mL of GH Diamond Nectar (not promoting this product, just using it as reference).