My last terrarium was a fish tank, turned on it's side so it was tall but not very wide, I had a real estate sign that had been cut to the correct size for a door, (Which was located on the side of the tank) and a big hole in the middle of that door which was covered with a very fine mesh to let air circulate. I would have to spray my tank everyday as it had very low humidity because of the circulation.
I recently upgraded to a proper frog tank (according to the people at the local pet shop). It looks like a normal glass tank but it has a piece of glass running down the middle so the tank is divided into 2 sections, one dry, one wet. The wet is 100% water and the dry is just a substrate. The new tank has a glass lid that has a 1-2mm gap around the edges to let in air. But since i have moved my frogs in the humidity has increased so much I havnt had to touch my spray bottle at all.
Should i change the lid? Or let it air occasionally?