So i have an 18x18x18 exo terra terrarium with a compact top at the back side. The humidity is I was searching around and found out that several reptile keepers cover the top mesh to help in holding more moist inside the tank. I was going to cut a piece of perspex or glass and put it on the top. so i will have the perspex or glass on the front side and the compact top on the back side. do you recommend it? and what about the ventilation?

Thanks before hand.