The covers aren't air tight, neither is a sheet, so you don't have to leave it partially uncovered for air. Ever do a sheet fort when you were a kid?![]()
If they are OK with the set up then I would leave it as is. I use a sheet and a little throw as well when it gets cold for my tiel, though he prefers it to be totally covered, so I don't leave a crack. It is all about the birds preference. Tiels can get night frights if you change up their sleeping arrangements too much.
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