04-02-2008, 05:29 PM
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I would be surprised to see a guppy jump out of a tank. But if you are looking for something a little more durable than aluminum foil, then take a piece of cardboard and fit it over your hole and cut out a pattern. Then take it to a local glass store and have them cut a piece of 1/16" plexi glass using your pattern as a sample. It will cost less than $5 and you don't have to worry about messin up the aluminum foil.