i would use the etss 500 ,
i believe it is a better unit than the reef devil , that is what i use on my 72 gall with a mag 9.5 pump
i also use a etss 800 on my 200 gall,
richie rich,
what pump u running with the 800 how do u have your return back to sump set up to reduce any bubbles perhaps u got a pic u could share with me