Honestly, if you have a background, id make panels for the 2 open sides. Leave the door open. Help the froggies feel secure anyways. If no background then do 3 sides.
If you don't like having gaudy pink or blue insulation showing, people still slather them in silicone and eco earth so its pleasing to the eye. i would not recommend expandy foam. Itll never come off the screen.





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