Should I be worried

Hi guys, one of my plant is starting to show some signs of leaves folding.

Check out the picture

I read that it could be a magnesium issue, i'm using tap water.

Would you guys agree with that verdict ? Should I use distilled water ?

OR maybe im just freaking out for nothing...
regards

hmmmmm? what are your temps?

Your plant looks fine in that picture.

My temps are elevated, I know its an issue....temp when the light is on, is around 34C(93.2F) I know its too much but I read that its tolerable for the growing phase, not okay for the flowering phase. My room is cupboard, I removed the back for better ventilation. I read a post on this board about how to make your own cooltube, doesn't seem to be that complicated even if I consider myself a terrible handyman...

I want to buy one big fan, but dunno how many cfms I need. For the moment I have 4x120mm (87 cmf) each. [FONT=Verdana, Arial, Helvetica, sans-serif]When I realized the temps was way above the recommended temp, I set all four on suck hot air out. Just a guess here, gimme your opinion, Since my plants are in their second weeks of growing, my lamp is pretty low in my cup board. So maybe my fans arent strong enough to suck the hot air out.
And also since im living in Canada, colder days are gonna help a bit.

I read also that it is not recommended to blow air directly on the plants ? Is it true and if so, what about all the setup I saw on the net where the guy basicly only has one huge fan blowing the hot air out? Id really like to know your opinion about the kinda fan I should be using.

My cupboard is pretty standard, about 6'X2'X1'

P.S thx guys your are replying fast are your advices are well appreciated

Also guy I forgot to tell you, when I took that picture, my 400watts hps lamp was about 10'' from the plant, it wasn't burning hot, but quite hot.
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if your not seeing any type of browning in the veins or patchy spots its a heat issue. what type of reflector are you using? is it possible to enclose it to pull the heat from it. if you can isolate the lamp heat and extract it. then have a seperate exhaust and a passive intake your temps will come down considerably

""if your not seeing any type of browning in the veins or patchy spots its a heat issue"

I guess I'll have to wait a few days to say how the plant is evolving.

I'm sorry but I'm too much of a noob to tell you what kind of reflector I'm using, it was sold with the lamp as it. Check out the picture.....I'd say its a rather small reflector since I grow my plants in a cupboard.

I do know that a cool tube is the best way to keep my room cold...but kinda expensive..

But since the back of my cupboard is open, a good strong fan wouldn't do the job in your opinion ?

regards

a strong fan would help but its all about how you use it. like i said the first thing is trying to cool that lamp. is that the ballast that one of the fans is sitting on? I would figure out a way to have that part out side of the box, right now its acting as a tiny little heater. look in the diy section of the general marijuana forum and there are some nice build guides on there for cool tubes that cost about $20 to build. that would be your best for lowering the temps. the next thing is air quality. it would be best if you sealed up the box and set up an air exchange. a small fan at the top of the box blowing the stale air out and a small intake passage at the bottom for fresh air intake. but first things first. check out the coooltube build and get one built. that would help tons

Yeah your right I should definitely try it out. I moved some of my fan and the temperature drop about 2 degres, and the leaves are no longer folding.
Thx you very much !

The black box your seeing in the picture is a pc power supply which powers my fans

thats heat stress. I grow at 31-32C currently and its normal for plants to go twisty a bit due to that.
When the plant will grow a bit it will become stronger and even if you keep the temps like that it will "heal" and be just fine.
I ran a complete run over with temps higher than 35C and altho the plants DID NOT LIKE IT they gave a decent yield of some pretty fine nugs.
the curly leafs symptom disappeared after about a month after rooting.

but some things to worry about when running high temps are;
1. rot. high temp = more evaporation = more humidity. humidy + heat = MOLD AND ROT. always supply sufficient air circulation.
2. 'sun burns". don't get water on the leaves - the drops can make em burn.
3. over-stressing. your plant is already not getting the best enviromental factors so its more delicate.

thats exactly my situation until I make a cooltube,thx you very much