What size tank and what pump do you hope to use?
On my 20g I use a 1" drain with a 3/4" feed using a mag5 as my return. Given the height of the overflow that I'm using, I could in fact step up the pump to a mag7 I think since my water level in the tank can go up a full inch before hitting the tank trim.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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