New grower needs help

[Gummibearz]

I need help to identify the problem of my 2 plants. Not sure if nitrogren toxicity or other problem. Only affecting lower leaves and 1 at a time from what i can tell. Here is some info that i know.

Strain - crack baby (clones)
# of Plants - 2
Grow Type - Hydro
Grow Stage - veg
Setup ?
Light -30 Watt LED
Nutrients - General Hydronponics
Medium - clay pellets
PPM - ?
PH - 6
RH - 33%
Room Temperature - 88F
Solution temp - unknown
Room Square Footage - 4x4
Pests - None Known

Problem: I'm having a yellowing of my leaves until they fall off, as well as "the claw" Any ideas?

 

[daTenshi]

I have no experience with that line of nutes, or with hidro, but discoloration on that leaf looks like magnesium deficiency. Add some cal-mag, or epsom salts.