I did too. Lol I was growing in the spare bathroom inside the bathtub. Nice easy drainage. I've switched to hydro since then and have been running large volume single plant hydro setup inside a 3x3.
Gonna try two cobs with one plant in hydro in the tent and two cobs outside of the tent with two five gallon pots of promix. They are all auto ultimate. Should be interesting. Might try three cobs in the tent though. I've been running it with just two for the past couple years. Might be worth it to add an extra. I would still have one left to do a plant outside the tent