Either Nitrogen, or Magnesium deficiency?

I have a few girls about 6 weeks in and one of the Snow White has started to drink less water and the upper fan leaves look like the clipping below. I thought it was a Magnesium deficiency, but I am unsure if that is correct. The last picture shows the Snow White in the tent, it appears to be under heat stress, but the temps are always under 80.

Thanks for any help.

what lights
what nutes
what medium
which soil
what are your ppms at
what is the ph at

400w HPS
Big bloom, small amounts of tiger bloom and calmag
Soil
Not sure dont have the meter
Not sure dont have the meter

definitely magnesium the veins remaining green is an straight give away

thanks maps84!

wait you dont know your pH?

1- go to the pet store
2- go to the fish section
3- find the pH kit
4- pay for the pH kit
5- go home (unless you live at the petstore, in which case ignore #1 too.)
6- check the pH of the mixture of stuff you add in
7- check the pH of the runoff water.

^ that will work til ya get a good meter. and its like 10 bucks

dolomitic liiiiiiimestooone! =D

nick17gar said:

wait you dont know your pH?

1- go to the pet store
2- go to the fish section
3- find the pH kit
4- pay for the pH kit
5- go home (unless you live at the petstore, in which case ignore #1 too.)
6- check the pH of the mixture of stuff you add in
7- check the pH of the runoff water.

^ that will work til ya get a good meter. and its like 10 bucks

Click to expand...

Just so you know, the PH of the Runoff means nothing, that's not the way to measure PH

I bought the GH ph test kit at my local grow shop for like 8 bucks. It has a better ph range to use with these plants, as the fish tank ones only show 6.8 thru 8.5. The GH one shows 4.0, 5.0, 6.0, 7.0, 7.5, 8.0, 8.5. You can get it online if there's no grow shop around.