First grow. Need some help/advice

Hey all this is our first grow need some help diagnosing the first issue thats popped up so far(pics below).

Grow info
First 8 days were under cheap 2x t5 30w each
5 days under t5 h0 6x39w (which is what the are currently under)
soil at the moment = peatmoss/potting mix

Problems = The ends of the leaves are yellowish, Also the the power africa's stem is red.




Skunk 11
http://imageshack.us/photo/my-images/600/20111003115349.jpg/


Power africa
http://imageshack.us/photo/my-images/441/20111003115317.jpg/



The set up at the moment( Will be cleaned up very soon, Reflective material should be going in there as soon as their ready to be transplanted)
http://imageshack.us/photo/my-images/689/20111002200135.jpg/



Power africas red stem
http://imageshack.us/photo/my-images/338/20111002182113.jpg/

Quick questions
How far would the t5 h0 6x39w get the plants? Will more lighting be required until its time to start flowering?

What colour spectrum should we be using during veg?

Are the leafs burned from heat/being to close to the lighting or may it just be a nutrient deficiency?



any info/tips would be much appreciated