What is Reddit's opinion of VIVOSUN Grow Tent Support Pole, Hanging Bar for 4 by 4 Tent?

From 3.5 billion Reddit comments

It's normal for the walls to suck in a little with proper negative pressure (as long as it's not so much that the tent looks like it could collapse inward).

If you want more space inside, you can make a cross bar type thing around the middle. Easiest way is to bend a thick coat hanger straight, then bend it around two of the poles about halfway up the tent. Repeat for the other two sides. Just try to keep your vertical tent poles straight up and down, ie dont have too much tension with the coat hanger.

There's other more sophisticated ways to accomplish this, but the coat hanger worked for me. Something like this from amazon would probably work as well to brace the sides:

https://www.amazon.com/VIVOSUN-Grow-Tent-Support-Hanging/dp/B07WGS2RF8

If you want, you can tape a square of thin A/C filter foam to the ports which will prevent hair and some dust from entering the tent. Not sure about light leaks since I run autos.