It's funny, I wrote it that way first, then I was like that can't be right lol, but it was.
So I would need any pump to feed the reactor then use the Para Pump to pull the water out of the reactor back into the tank.. do you all suggest a small pump to feed with something in the 300-400 gph range?
You won't need a feed pump. The peristaltic pump will create pressure enough to pull water from the sump/tank into the reactor.