Hello again to everyone!
Thank you for all your feedback.
Since my last post I have made a few changes, I put the lights on a 18/6 cycle and lowered my temp to 79-85(its the best I can do), my light is now 15" from the top of the plants and I repotted them in 1 gal bags.

In reply to all your suggestions no I am not using r/o water, I have been using distilled bottled water but have just switched to tap water.

After watering my plants I ph tested the runoff and it was 6.0.

Now about the calcium defiency I consulted my local grow shop for some info and they told me that there are small levels of calcium and magnesium in the nutes I am using so a defiency MIGHT NOT be the problem but they thought that I might have been underfeeding my plants so I fed them.

They look much greener (sort of) but the problem I am having now is that they seem to have stopped growing, the leaf tip are curling up and down, and they are looking a little crispy.

Is this nute burn or another defiency?

http://img241.imageshack.us/img241/9537/img1543et2.jpg
http://img241.imageshack.us/img241/8383/img1544ss5.jpg
http://img489.imageshack.us/img489/259/img1577mt1.jpg
http://img337.imageshack.us/img337/4431/img1567wr8.jpg