New growth thin, yellowish, not hearty

Dear all:

I've consulted the list of deficiencies and problems to see what the problem may be with these plants (they're about a month old), and if I had to make a stab at it, I'd guess molybdenum deficiency, but I wanted to double-check with the experts here before treating it:

Any thoughts would be greatly appreciated! I'm growing in a Phototron (all I have room for) and using their Continuous Growth Formula...contents unknown. :-/

It's probably either too acidic or N deficient.

Need alot more info. Nutes, grow medium, feeding schedule, PH. I an Mb def would not be my first guess just because you don't normally see those.