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#1
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If I remember correctly, the correct measure is 1 1/2x the hole diameter from the edge and 2x the hole diameter from another hole.
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#2
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If it were your tank how long would you place the holes? I need to take into account the elbows for the drains for the BA overflow.
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#3
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Are you thinking of doing an internal or external overflow?
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#4
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Internal
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