Name that deficeny? PICtures **** Holes in my leaves?

or maybe salt toxic build up? these are clones on the 2nd week of veg. Roots are booming just now... had a problem with the cold weather in my tent but now I raised the temperature and i see growth.... only problem is.... My tangerine Kush has these weird copper colored spots , yellowing leaves, and the tips have turned brownish,curled and crispy...... Can anyone help me diagnose this problem?




18/6
4x4 tray - 40 gal res
Ebb and Flow
Currently under two CFLs with bed sheet shading my 600w hps
PH 5.9-6.0
PPM 420

anyone? i will post some new pix soon...

Zinc/Mg....maybe?

i put cal/mag in my res..... maybe its zinc.... i dunno shit... they are starting to look better but not really....