I keep one of mine in a 20 gallon long as well. There are lots of tips for humidity, first off do you have foil covering a majority of the top of the lid except for under the lamp and a little on the opposite side for ventallation? If not that will help to keep the humidity in the tank. I like to cut out a piece of cardboard how I want it then wrap that completely in foil so it won't mold and place that on the lid. Its just sturdier.
The substrate you use will effect the humidity as well. The best substrate to keep up humidity is a coco fiber or husk substrate like ecoearth or reptile prime.
Moss will help a lot as well. I like to mix it in with the substrate as well as make a little hedge around all the edges around the tank with it and spray them down directly when you mist the tank. (A nice mister for misting the tank is good too)
Another good method is using dish towels or washcloths. You can place a dish towel over about half of the top of the screen top to help hold in humidity. You can either place it under the foil or do this instead of the foil but along with foil works best. You can also place wet wash cloths on top of the hot hide or both depending on how high you want the humidity. I spray those directly when I mist the tank along with the moss as well and take them out and rewet them every few days. The towel on the lid I rewet everyday but you could probably do every other.
Hope this helps!
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