to answer the cardboard question backgrounds are fine in theory and can look nice .......But it drives me nuts when water gets between the glass and the backdrop it gives a better impresion with a solid look on the back of the tank. solid color makes people focus more on whats inside than being distracted by a sloppy background or wires and tubes.
Any kind of latex enamel will work. 2-3 coats let dry completely after each coat. Scrape it off with a razor blade if you don't like it. I used Rustoleum but any kind will work. Mine is black but I heard navy blue looks real nice too.
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