like keeko said, move'em closer to the light. They are stretching to get the lighty goodness they need to grow. Also at that height you may want to consider doing some LST'ing, would help mitigate the high and end up getting your more bud sites in the end.
Gundari Reviewed by Gundari on . Why are my plants so tall??? yes, i know tall=awsome.... however, many plants that i see (online and of friend's) have almost as many branches as mine does at 2-3X the height. ie: one of my plants is 28 inches (topped 3 weeks ago at 20 inches) and has about 8-10 nodes only (not counting the 3-5 that are within about 2 inches of the tip) for the amount of foliage on it, it is almost comparable with plants that are around a foot on this site. My lighting consists of 3X 23w spiral CFLs, 2X 70w outdoor floodlights, Rating: 5