Fan leaf deficiency

Hi all

Just flipped my girl to 12/12 an 4 days ago an have noticed this on 2 of the plants not all the plants have it.

Running a 12 pot IWS DWC system with Canna Aqua EC is at 1.0 an the PH around 6.0

Temp have been hitting 30c/86c some parts of the day.

Mac: you've got a couple of possibilities here. I've been told 86 degrees is too hot. I'd try to keep it from 65 night to 75 days and your reservoir at 65.

A build up of salt from your nutes can cause your problem. Do you regularly change your nutes? Do you periodically flush your system to get rid of the salt build up from your nutes? It looks like nutes stress or lock out.

If the rest of your plants are okay then you have a couple of choices; wait and see, they might get over it or treat them all before it happens to all of them. I like a more gentle change to flowering in both lighting and nutrients. That's what I was taught and I haven't had this problem. I hope that helps. HSA

yeah hopefully nute burn as all the new growth hasn't got any on an its not got any worse over the last few days.

no way can i get my temps down to 75. i have cooling hoods with 6" fans on them an also 6" bringing fresh air in an 8" taking out via carbon filter using the evolution temp/humidity controller an fans are on full whack at 28c

It looks like a nute problem, have you been maintaining your PH and PPM? And a easy way a friend I know use to keep his res. cool was with frozen bottles of water. Drop them down into your res. You have to play with it to figure out how many bottles it takes to keep it where you want it , but it worked for him.