I've repotted several tall skinny plants and it always helps strengthen the stalk within a few days and they start to fill out well.ok read some posts saw some good info and some bad. First lets get rid of a myth. The fan dosnt do much to strengthen the stem. Put 2 plants outside. One with a wind break and one wide open. The one behind the wind break will be just as strong as the other. Fans are needed in a stagnet enclosed area like a tent to move the oxygen rich air the plants resperate away so fresh co2 laden air can make it to the stomata. The circulation also helps with powerdery mildew.
Ok thats over. Now lets address the cause of the stretch. Plain and simple they are stretching for light that isnt there. Easy fix. Add more or move your light closer. Repoting deeper works great however never plant them over 1/2 deeper. The soil below that stays moist much longer. Maby not today or tomarrow but eventually you will lose a couple that way to dampening off. 1/2 inch deeper is plenty. Check out my journal