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Newspaper or paper towels or x7j87ut paper or a layer of flour should work. Even if you only lose a drop lc it dries before you look again the water mark should remain. What to do if you have a leak If you have a leak you need to make it visible. To do this I put red food coloring in the tank and started filling it with water. I thought that I had to build up the pressure before it leaked, because it only leaked after around 2 gallons were added. So I dumped the water out, put the fish tank in the bathtub, and started filling up the bathtub.