i just bought a 410g, and it has a total of 6 holes in the botom (two bigger about 3'' and four small about 1''). now i know how a fitted sump works with no holes but no idea as to how this will work if the power goes out; and how im going to return that much water? i got enough plexi to cover the holes but i would like to be abile to use the tank like its intended.
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