I'm thinking of moving my whole sump to my first floor that has a great
window w/ natural sunlight for a refugium.

I think it's about a 16ft rise back to my tank (20' for margin of
error), so would a regular oversized submersible pump work? I'd expect
lower water throughput then it's rated, but then that's why it's oversized.

If not, where would I find a suitable pump?

--Kurt