new seedlings yellow blotching

Hey all first dwc grow and come across a problem in the first week.
I'm using the canna feed guide and gave only half of the recommended dosage for seedlings.
Did I go too early?
Or should I be addind cal mag next water Change.

Any suggestions?
Cheers



Probably should of mentioned
Ph 5.9-6.0
Ppm 430
Water temp 69.69f

2 1/2-3 weeks old?
Start feeding.

Only 1 week old. As i said I've been feeding at half strength.

Canna guide calls for 38mls per 17 ltrs of grow a and b
So im using 20mls per 17 ltrs a and b
With a ppm of 430-440

Ppm too high for seedling? ?
Canna guide says ppm of around 400. Sounds high for the little girls

Way too early to feed. See those funny looking first set of leaves? Those are the stored food source for the seedling and I wait until they start withering before feeding. This make the plant produce a larger root mass because it is having to grow them to look for food.