Leaves edges curling up

Hi guys!

My one leaf is starting to curl up....any ideas???

Growing under a 600W MarsHydro reflector 20 inches away and a 400W MH 20 inches away aswell.

The rest of the plant looks fine.....could it be wind burn??

I have attached 3 images....One shows the temps and RH, the other the plant a day ago and the most recent picture, with one of the leaves curled in!!!

Growing in a bubble bucket. EC 0.5 PH 5.5-6.2

Thanks for any help!

Let it be. Looks good. I'd say .5 ec for that youngin is juuuuust enough for a little nute burn.

ok, thank you for your fast reply! ill sleep a lot better now

Just noticed that the lowest leaves are starting to curl in aswell!!??

Should I lowe the EC???

Edges curling up is a sign of heat stress so be sure to measure your temps right at canopy level. Try to keep at or below 78F unless you are supplementing with CO2.

That plant doesn't need much food yet.

I think your right about the EC being too high.

I removed 1 gallon out of the bucket and replaced with 1 gallon RO water. EC is 0.4 now.

I will update with progress...

thanks for your help!

The curling up around the edges looks like heat. The tip burn looks like too much nutes. Neither look too bad at this point. The curling around the edges will persist even after you solve the heat issue so don't freak out too much if it doesn't get better right away, or even gets a little worse, sometimes the heat stress response is a little delayed.