Need some tomato help

[vegmaster]

Hey guys, first post so please be kind.

A little over 2 weeks ago I started two strains of tomatoes in my hydroponics system. At the beginning of week 3 (2-3 days ago) I decided to start them on GH Rapid Start to encourage roots so I can transplant soon. I mixed the recommended amount.

I've noticed now that while my plants are growing better looking roots, the leaves have gained a white tint on them. I'm not sure if this is normal because of the new addition of nutes, not enough light (currently have them under 300HPS 18 hours/day), or something else.

I tried taking pics but they won't come out properly to show what I'm talking about so I'll try to give more specifics here. The white coloration is NOT spots or mold. It looks more like in Autumn when leaves change color. The plants are indoors so I also am inclined to think it's not fungi either.

All help appreciated,

Vegmaster