Forgot to shout out Mikedin and a few others that also put in some really good info.
@ayeob - I read your questions about air circulation and fan placement. The overall idea that you are trying to accomplish is to have some plant movement along with air movement inside the tent. I like to place my fans in a way that starts a sort of circle that moves around the tent. I'll place the fan in the corner and point it at the other corner but a little off axis so that the air hits the other wall and bounces off it at an angle where the deflected air will move towards the wall next to it, etc. Essentially what you would be creating is a sort of tornado of sorts where air is moving around the tent in a circular motion.
I find this helps in oxygenating the roots through the cloth pots as I place the fan low, like maybe, 6 - 12 inches off the floor.
One thing I do that is a no no is lifting the cloth pot off the floor. I've run tons of cloth pots sitting in flood tables without any under pot circulation and have no zero ill effects.....that I know of. I'm going to lift the pot off the floor on my next run and see if there is a difference. I always check roots after harvest to see if there was anything harmful happening in the "rootsosphere" where I need to change this or that process and, to date, I've been fortunate to not have any root rot or any other issues.