^^Yes very stretched from lack of light. Get all the CFL's you can afford and put them as close to the plant as possible, 1 to 3 inches away at most (depending on strength of the bulb) and all around it, not just above. Check out Post #7 here: http://boards.cannabis.com/indoor-li...-lighting.html

From what I saw in the pic, the yellow tip is nothing to worry about ATM.

Next time you transplant definitely get some perlite like redtails said and stay away from those "moisture control" soils.

Just to repeat redtails again you should get a fan in there to help dry out the soil but also to get your plant waving a little, it'll strengthen your main stalk and stems and reduce the stretching.