Sump flow rate

[NanoCat]

I have recently plumbed up my new custom 25 gallon tank with 20 gallon sump/fuge combo and have a question about flow rate.

I have a mag 5 split into two returns and have calculated the actual flow it gives me at the given the head and union loss.

It tuns out that I get about 170 gallons per hour though the sump/fuge combo.

This gives me about a 4.3 x tun over for my total system volume of about 40 gallons (this volume will probably be less with addition of sand and live rock.

I have a tunze 9002 skimmer and a nano remora skimmer for the sump (not sure which one I will use yet).

I will be using my mp10 for flow in the display tank.

My question is this a good rate of flow for my sump/fuge?
I think it is but was worried it may be on the low side.

Thanks in advance for your help.