lilbud99

I need some help identifiying why my plants have developed yellow spots.
Thay are currently 6 days old and range from 2" high to 4 1/2"high.
they look and seem to be growing well apart from these spots.
They are small light yellow spots in various areas of the lower leaves. although new shoots not yet showing signs!!??
Started seeds off in jiffy pellets, did very well , transplanted them into 9x9x15 pots once roots showed thru sides of pellets. gave plants a good watering with added coco A+B additives, ( as recommendeed by guy in grow shop.) I used less than the stated dose and they responded very well for first 5 days then spots started appearing.
Have looked at arious books and websites for info but can't find much on early stages off plant growth.
I am thinking i may have over watered them, i think the plants too young too have any major deficiencies. seeds are big bud / magic bud cross.
Using 400w hps in 1m2 cupboard area,
coco medium. ph 6.5 - 6.8 ,ventilation good, humidity good. 18 - 20 hrs of light at moment.
any help / info greatly appreciated as im reluctant to start again form seed as time is an issue for me.

C-Town

Heya lilbud, welcome to HC.com.
I'm gonna shuffle this off to the Nursery, for ya. M'kay?.