I have four fans in my tiny tent
1) a 20" box fan thats about 2" below the top of the tent and right above my LED fixture. Its on a speed controller set to a super slow speed. It blows UP and its job is to cool the lights and help with circulation. It runs 24/7.
2) is a bath fan that sucks air out at the top of the tent and blows it thru a DIY carbon filter into the room. That one is on a temp controller and shuts down if the tent gets too cold = below about 72F.
3) is a small inline fan that sits in the fresh air intake that runs to a window in the room. That one is on the same temp controller as the above fan, but it turns on when the tent gets to hot = 80 deg F and pulls in cool fresh air. Well, at least it works that way as long as its not in the 90's outside!.
4) is another bath fan that also sucks air from the top of the tent and out to another DIY carbon filter, but this one blows it back into the tent under the canopy - just like @LemonadeJoe suggested. This one runs 24/7.
Thats probably over kill for a small tent, but thats ok too