tearing down tank (need help!!!!) drilling

michaelwb

Member
okay, my tank has been up for 6 months, and i'm tearing it down to finally do plumbing the way i should have the first time.
I am going to drill the tank, how do i know what the GPH is going into the sump with the bulkhead and strainer, just a bit confused and what size should i get in diameter and length
the tank is 20 gallons by the way.
 
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