Flow rate.... but....
Honestly, I've had far too many problems with bulkheads less than 1" in diameter. You wouldn't believe how easy it is to get plugged up! In my 26 Bowfront, I have one 1" bulkhead with a modified strainer system providing the overflow. It works just fine. For what it's worth, I have a Mag7 Return but have it torqued down with a ball valve because it is a seahorse tank.
Dave
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