plant problem ???? pics

Here are a couple of my plants that are frowning and I am not sure what exactly the problem is.
I have a total of 9 plants that were put into 12/12 a little over a week ago.
Most look real good but two are showing signs of yellowing of the uppermost leaves or new growth.
The strains are nirvana ice and blackberry.
Only the ice are showing these issues.
I am using Dutchmaster gold at 1200 ppm (using well water that comes out of the tap at 310 ppm).
Temps in the room stay right around the 70-74F range.
Reservoir temps are also in the low 70s.
I did have some fungus gnats and treated them with Azamax and it pretty much took care of them.
My system is a top drip that runs contiuously and they are in Hydroton using a 1000 watt HPS
Any help would be appreciated.

Oh and the PH... I keep it around 6 using the dropper thingy and the reference guide on the back of the bottle

Looks like either a slight N def as well as a calcium and iron issue as well. I dont run hydro though so maybe someone will pop up and help that knows a bit more than I do. But it def looks like a micro nutrient deficiency caused by maybe lockout or something.

53 views and only one reply (thanks for the input by the way SBS).
I would REALLY APPRECIATE some help from the experts here who can help me with this.
I have alot of money riding on this and dont want to lose the time I have already invested.
Again, thanks for the time it took to read this and ANY help would be greatly appreciated.

definitely an iron problem. kinda surprising when using well water. as dumb as it sounds, you can water with rusty water to correct this issue, or add any readily available hydroponic iron supplement. it's important to remember each strain has different needs, which is why one variety may look healthy, while another in the same nutrients may suffer. if you use the same reservoir for the two varieties, then one may be using the iron at a faster rate than the other, causing a deficiency. for best results, i recommend limiting it to 1 type per reservoir.

one more thing. if it was a nitrogen deficiency as one of the posts suggests then the yellowing would begin at the bottom of the plant, not the top. also, plants experiencing iron deficiency frequently have Zinc and Manganese deficiencies. Cal-Mag Plus from Botanicare will have all 3.

Thanks, RRLBT420 I was thinking the same thing.
My well water does not have alot of iron but does have alot of calcium.
Iwill try to get an iron supplement on monday.
Again, thanks for your input

flamethrower1 said:

Thanks, RRLBT420 I was thinking the same thing.
My well water does not have alot of iron but does have alot of calcium.
Iwill try to get an iron supplement on monday.
Again, thanks for your input

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no problem man i know plant problems can be frustrating. good luck let me know how it goes