FF....if I can add something here...the very best way to keep them short without LST is to HAMMER them with light.
How many plants do you want/need to run in the tent? If you don't have to run lots of plants in a
Sea of Green-type fashion, then you might try running a bare bulb with no reflector. You can loop the lampcord over something at the top of the tent and simply let it hang down in the very center. Then the plants will be placed around the bulb so that they encircle it. With a style like this, the plants are encouraged to bush out toward the bulb horizontally instead of shooting straight up. Then all you have to do is turn them once or twice a day during lights-on to keep everything even. Am I making any sense?
I have experimented quite a bit with this very same vertical lighting style that I'm describing to you and believe me IT WORKS WONDERS!
BTW.....a new space that I'm gonna be building is gonna be setup to use vertical lights. Whether you want to go this route or not is totally up to you. I just thought I'd throw it out there.