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i have a 120g with a calfoesque overflow. i made the overflow box 4"x4". i made it just big enough to fit an upside down elbow in the box with about 3/8" space between the elbow and the bottom of the overflow box. this keeps the gurgling down and prevents anything larger than 3/8" of an inch from getting into the drains(snails mostly). hope that helps
check out my little red house you'll see some pictures.
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-Scott
Whenever I’m about to do something, I think “would an idiot do that?” and if they would, I do not do that thing
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