More Sump Questions... Experts please help!

[ner'T']

Hi, I'm hoping that some of you can can share your knowledge...

I'm setting up a 20G tall sump for my 37 gallon reef, (currently sump-less). 52" head height to tank and a 300 gal/hr CPR overflow.


-What pump brand/size do you recommend?

-How large do you recommend making the return section, (I have a
auto-top-off)

Thanks in advance for any advice!