Ideal pvc diameter for 90 gallon

[Spydersweb]

Hello all,
I’m about to start building a sump for my 90 gallon aquarium. I’m just wondering if there’s an “ideal” inside diameter for the intake and return plumbing. The bulkheads that are built in have a 1 1/2 inch diameter. Should I go with this size, or would a 1” or 1 1/4” be better based on personal experiences? It will be a FOWLR, if that matters.
Thank you in advance to whoever can help me with this.

 

[joseserrano]

you need to use the bulkhead that the hole was made for. If you want to reduce you can do that with added plumbing parts.

 

[Spydersweb]

Yeah, that I kind of figured. I’m going to be plumbing the return up the back of the aquarium though. Should I stick with the 1 1/2 for the return, or do a 1 1/4 or 1?