Re: Silicone glass pre foam.
Every time I have ever constructed a foam based background I have first applied black silicone to the back and on the sides. I would go further toward the front of the tank with the silicone than I intended my foam background to be so that I could go back with a razor blade after I had finished the background completely and cut and peel the extra silicone away. I would basically trace the line of foam with the razor blade. I agree, this made the sides look super clean.
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