Yellowing to center of leaves

Hi, im new to this site, and it looks great too.

This is my problem,

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Sorry i dont no how to put pics up directly on this site.

They are 'KRONIK' clones about a week old from rooting. In 30ltr pots under hps600w lamps with adjusta-wing shades. They were very healthy up untill i put them in soil 3 days ago. Since them the leaves have slowly started to get yellowing as you can see them in the pic.
The soil is a mix of peat moss, palm peat and a poting mix/ sheep manure/ pummice mix. I ph test fert and water before watering (6.5) and source the water from a drum hooked up to the roof of my house, utilising the rain. The soil ph test is perfect (6.5). I fert with reputable fertilisers and never had this problem till my last grow , which i pulled after extensive tests, because it was easier to just start again.
The shades are 20" away i spose, just to go easy on them still i sort what the prob is. The room temp varys from 18-25 degrees celcius day and night. 40 -60% humidity day and night.

Any ideas or help will be much appreciated.
This is stressing me out!!!!

Thse are all i can think that could cause this from net research.
Zinc deprived.
Too Cold watering .
Watering onto the plants with too too strong fert while the lights are on, burning them.
I dont no, just some thoughts.

What ya rekon?

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sorted the pic.

Anyone got any ideas on what the problem is?
dying to get to the bottom of it . PLEASEEEE???!!!!!

from what i know it seems young to have ferts already. specially with the soil also, when you water is it tempted? and another thing probably cut back on the nuts to like 1/4 or even 1/8 str. have you tested rain water?

Rain water can be quite acidic.
Palm peat = coconut husk fibre? You may have troubles related to high coco content if that is the case (it prevents Calcium uptake by scavenging and locking it) and will want to make certain you water with calmag to prevent this.
Rain water= NO mineral content at all and needs calmag added, period. It is also frequently acidic from atmospheric N and S gases that go into solution as their respective strong acids. Calmag WILL help this; add it to 300 ppm and then test pH after addition. ADjust to 6.5 for your soilless mix.

The damage looks like a metals lockout or deficiency. I'd raise the lamp just a bit to let the plants get established, and do a LIGHT foliar feed with the 'micro' part of the GH 3-part, or a comparable micronute supplement. Algoflash regenerateur is one that should be easy to find in Europe (you give temps in 'C... lol... I assume you're on the other side of the pond).

Also next time you mix up media, remember:
-If you use peat moss, you must add some lime to balance out the acidity.
-Soil lighteners such as Perlite are very important

Another possibility is that the new growth of your tender young clones is simply getting scorched by going IMMEDIATELY under the big lamp. I like to let my clones root up nice, and then actually leave them under flourescent shop lights during the hardening-off period, about a week, during which time I remove the dome and mist them with SMC lightly to get used to the drier surrounding air.

wow!! , you really know what your talking about aye.
I had put dolomite lime in with the soil mix , i forgot to say.
I agree , i think that i have ferted them to young. Since then i have been watering with no fert from my tap inside, and not the rain water to see if it will fix the problem. Il see how it goes and let youz no.

I really appreciate the advice from you all.
Cheers heaps.