I had a similar issue but also with the heat. 2/3 of the top was mesh and the other 1/3 a solid glass that is permanently attached to the tank. That's how they sold this one. I researched and after figuring some things out, I cut cardboard pieces into the right sizes and covered them in Tin foil so that the shinier side faves out and the duller side faces the cardboard. I put these pieces on the mesh just. I cut them so that I have shorter pieces so that I can put the heat lamps on the mesh but not on the cardboard/foil pieces. This way heat AND humidity stays in the tank. I lift them and waft fresh air in every day so it doesn't get too stuffy in there. The pieces made a huge difference. Less heat is wasted radiating out of the tank and the heat gets reflected back down instead of leaving through the mesh. Humidity stayed up because the top isn't open to let the moisture out. If i feel like it gets too humid, I take one piece off for a while. The smaller you make them, the more flexible you will be in terms of finding the perfect coverage. Arran wrap works too but it won't reflect any heat back down if you don't have issues with the heat. My tank is a bit over 100gal so I had a lot of trouble keeping either one constant until I had those things.
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