Leaf question?

[Agressor1]

I have a White Widow clone and it's been about a month since the date on the clone 1/15.. so, my problem is the leaves are starting to droop. Especially the bottom 2 fans, and the leaves facing my 400watt HPS light are getting black or brown tips and curling up, the ridges also seem to be experiencing a burn.. which i think may be my nutrients. I'm awaiting my water meter right now so I can't give measurements, but what sounds like the main problem? They feel a bit dry to the touch so i've been really fine misting the grow room. And i've got a fan running.

--The light WAS 18" from the plant and i moved it back to 24" when I figured heat stress may be a problem.

http://i27.tinypic.com/23wnurp.jpg
http://i32.tinypic.com/2ijg1sl.jpg

My first grow, btw.

[edit] that leaf is torn because the poor thing grew towards the CFLs I had it under for the first few days and burned.

[Agressor1]

I dumped my old reservoir, my friend said yesterday that he was going to pour in some more nutes and I remembered he was worried about burning, so fresh tap is in there right now.

[stinkyattic]

From the description I was expecting a LOT worse. That plant looks healthy, if a bit scorched. VERY slightly.
When you've got problems, there's a form at the top of the problem section with info on your conditions that you can fill out for MUCH better answers. Just copy and paste it into this thread.
Edges curling up is indicative of heat stress so raising the lights was agood move. Also, heat will make fertilizer burn more damaging to your plants.