Autopot grow - nitrogen deficiency?

Hello

Im growing 2 Autopot 15 liter pots with an "air dome" in each pot.

one strain is LSD and the one other is Tutankhamun.

they are both clones about 6 weeks old.

the plants seat in 50% perlite 40% soil and 10% clay pebbles.

They are getting Canna feeding "generative stage one":

http://www.premiergrow.com/images/nutrient-charts/canna-terra-scr-nutrient-chart.png

Also, becouse i understand that Autopot has sometimes problems with slat build-up i
did a small flush (about 20 liter of PH balanced water for each pot).

The temperature is around 28 Celsius.

The humidity is around 45% - 55%.

Also in the last two weeks i sprayed them with "Leaf Coat" from Bio-Bizz.

as you can see in the pics - the leafs tend to curl in a very strange way, and the edges of the leafs looks burned or something:

http://anonimg.com/img/957fc7df8e0866c07a6b33be64181455.jpg
http://anonimg.com/img/1ab6fcca215061937d428560b024f644.jpg
http://anonimg.com/img/608dd70e236c234ac65af71d045c5729.jpg
http://anonimg.com/img/f08cd401b4365210dd1aa6d0e3085883.jpg
http://anonimg.com/img/17c00c08a204e5659dbe109007302759.jpg


Thank you very much for your time - I will appreciate any feedback

Nitrogen problems present them selves as the leaves look like a "claw" and are a very dark in color. Ever thought of Heat being a issue> maybe some nutrient burn - remedy: flush for one week readjust your nutrient feeding and lighting

High N is correct.
You said you did a small flush. Good enough on that, simply lower the feeding amount. Say by 25%.
Run a Ca/Mg if you don't already. That will prevent "other" problems down the road.

pics would help

Less N more P K. Especially the K. Other than that it looks pretty green as fuck haha. Cal mag would help too if you got it. Even when I don't have deficiencies I use cal mag to prevent. Plus if you are using RO water, cal mag deficiencies are a given but not in your case.

Thank you very much good people - I will do a flush and start giving them plane water for a while...