Herbie Drain

[CountryBoy72]

I have a 110G tank that has a corner overflow with two holes drilled in the bottom of the tank. The Tank came with one 1 1/2" an a 1" pvc pipes. One hole will be my main drain an the other will my emergency drain. I have another hole drill in the back of the tank for my return. Does it matter which one of the two different size pvc pipes I use for my main drain ? Should they both be 1" diameter ? I also have the gate valves needed for the setup.