Edges of Leaves Brown - Pics

First time poster, fist time grower with a question.

I have 2 well rooted plants, from clones, in veg that have been there for about 2 weeks.
The plants have been growing fine, but recently I noticed some browning on the tips and edges of the leaves and was hoping someone might tell me what might be going on.

Here's the details:
DWC Bubbler
General Hydroponics Grow nutes
6.5 PH
White Roots coming through the netpots into the water.
Room Temp stays around 75 F
70 Watt HPS and Reflector 9 inches from plants
150 Watts in 1100 Lumen 6500K CFL's 9 - 12 inches from plants
2 x T12 6500K 2300 Lumen Tubes
24 Hour Lighting


Any help would be greatly appreciated.

Not sure why I can't upload images so I've linked 'em.

http://www.milehighbudz.com/leaves1s.jpg
http://www.milehighbudz.com/leaves2s.jpg
 
Top