Just remember that you have to be able to change that filter media. what you are saying should work.
I have done 2 setups now with the Tetra InTank filters and they are workin out alright. they take the common tetra filter bags, and just slide in/out the top, so you can actually seal the whole unit into your background with the greatstuff. or like I thought of after the last one, you can wrap the filter in wax paper or something and spray the foam on it or around it and when the foam dries you can just slide the filter in and out of the little built in cradle..
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