I use a thirty liter one i think it was. Liter or quart im not quite sure but ull know when u go looking for one. Its basically one of the biggest ones u can get. I have a heat pad stuck to the bottom but to be honest this doesnt seem to cut it since my room is quite cold sometimes. What i did was place a small lamp above the lid, but not on it to where it could melt, and let it heat the general air inside the tank. This works wonders for humidity...ull notice that the walls will be moist in no time. So far rubbermaid has been awesome hehe. Lemme see if i can find a pick to show u. Ill post it later.

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