Return pump sizing

[csund]

I have a 40x32x24” tank approx 110 gallons

I had planned to run a refugium and three reactors off my return pump so I picked up an Abyzz A200 rated at 3700 gph. I’ve decided to ditch the refugium and reactors.

My question is could I run the A200 at 30% or would I be better off switching it out for an A100 rated at 1800gph?

 

[mfinn]

With just the tank in the picture, you really don't need any more than 600gph at the tank, so even after headloss,
( guessing average headloss of 5'-6' ) the A100 would be more than plenty.