Can anyone identify the deficiency pls ?

Hi guys I am just starting out growing and cant seem to get it right. The leaves seem to be a little bit more yellow then i would want them to.

Strain: RQS Easy Bud Autoflower
Light: 2 x 24W Daylight CFL - 18 Hr ON / 6 Hr OFF ( I will increase this to about 6 x 24W CFL at 3rd node )
Medium: Soiless mix with perlite and vermiculite.
Water: Distilled water at 6.5 PH ( used 3 drops of white vinegar to bring it down abit as it was at 7.3 PH )
What do you guys think is this plant gonna make it or is it too early to tell ? Its 1 Week old at the moment.

It is perfectly healthy for a seedling, soon you will fertilize it and the nitrogen will green the leaves. HTH?

I read that I shouldn't give nutes till the flowering stage begins. Sry for the newbie question but what does HTH stand for ?

Hope that helps. Correct do not fertilize it until it has first set real leaves.

looks fine.

as said, pending your soil you wont need to feed until like week 3 or 4. Then you can start to add in calmag and veg ferts slowly/small amounts.

why distilled water over RO ,less problems down the road with RO ,comes out at 052 ppm were i get it.