I would leave the Great Stuff for at least 3 days before going any further. If any of it is thicker than 1.5 inches I'd wait another 3 days after that.
Regarding the screen, I find it's helpful to put a layer of coconut husk over the screen to help keep the "real" substrate reaching the screen, since the screen isn't perfect at keeping debris out of the drainage layer.
Btw, you're making me feel lazy - I still haven't started on my Zoo Med conversion :/.





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