need help with new 93g cube tank

[reeefraf]

I want to upgrade my tank and I like the new Marineland 93 gallon cube tank. The proportions are 30x30x24 with internal overflow with 2 holes for one inch plumbing.

This will be my first tank with a sump and everything in the stand. My question is will the 1 inch holes be enough?

The tank manufacturer will customize the holes, should i ask to have them bigger to accomidate 1.5 inch plumbing or larger?

Optimally, how many GPH do i want through those tubes and sump?

Thanks