1st time Hydro needs help

I got my clone about two weeks ago...I decided to go Hydro..I am using the "Rainforest36" by General Hydroponics..my room is 4x4x6..Im using a 1000wtt. MH..My light cycle is 18-6..My humidity is between 22-32..I got her on Nutes...shes been doing real good till today...the leaves are turning yellowish and crispy with some dark spots...And mind you this is on the old growth...She still has new growth on top.. Could I b giving her too much juice?

i dont think its a toxicity looks more like a deffiency or just the older leaves dying up from stress , i would post this in the Mj problem thread.

By looking at the leaves in your photo, they appear to be curled upwards. This looks like a sign of heat stress. Whats your EC or PPM? What about PH? Also, remember with hydroponics (especially in enclosed environments) the plants use a LOT of water to keep them cool. Notice I said "water". The roots can leave the nutrients behind. Then when we add a few more gallons of water (following the per gal instructions on the nutrients) and all of the sudden your cooking the beejezus out of the roots. Don't laugh too hard, as this happens more often than one might think. Get an instrument that reads the total dissolved salts (TDS) in parts per million (PPM). I use EC as there is less room for error in conversion. Either will do. I calibrate once per grow. I bet if you check these things you might be able to piece it together. Good luck on your grow!

Booie420 said:

I got my clone about two weeks ago...I decided to go Hydro..I am using the "Rainforest36" by General Hydroponics..my room is 4x4x6..Im using a 1000wtt. MH..My light cycle is 18-6..My humidity is between 22-32..I got her on Nutes...shes been doing real good till today...the leaves are turning yellowish and crispy with some dark spots...And mind you this is on the old growth...She still has new growth on top.. Could I b giving her too much juice?

Click to expand...

That is a lot of light in a small space. A 1000 watt light puts off a bunch of heat. You need a PH tester as well as the TDStester. There is a lot of stuff you need to get started with hydro, but once you get it dialed in, it is worth any trouble you may have had in the early days.

TDS tester
http://www.eseasongear.com/hmditdme.htmlhttp://www.eseasongear.com/ph600.html

PH tester
http://www.eseasongear.com/ph600.html

I bought mine from this guy about a year ago and they both still work fine.

Thanks you guys...your info was much needed...and greatly apreciated....