Covering the screen top with foil is fine- & one of many options that will work- also is less "messy" than doing it all up in duck tape.
I like to use foam-core poster boards for insulating tanks- it's easy to work with & adds both privacy & insulation-
The heat is the biggest thing to get figured out & adjusted- & would have been best done before the snake moved in- but hindsight is 20:20- you'll know for "next time".
Forgot to mention, these thingsare rather addicting! (Too late!
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