on my 55 i have:
Tunze 6000 with controller(goes from 30% to 100% in five second intervals but sometimes i just let it blow full blast)
Seio 620
Mag 5 return
i had two MJ 1200 in there too but i pulled them as i dont like how they cheapen the look of the tank
STILL NOT ENOUGH FLOW
-I am adding either another tunze 6000, MJ mod, or tunze nano streams(like 6 of them and just sell the 6000 i have currently)
-i am also upgrading to a mag7, 9.5, or 12 depending on what my overflow and bulkhead can handle with SCWD
SO NO...GET MORE FLOW...I DONT THINK YOU CAN HAVE TOO MUCH FLOW
AND FLOW DOESNT CAUSE POLYPS TO CLOSE UP----ITS TIGHT, CONCENTRATED, DIRECT FLOW POUNDING INTO THEM THAT DOES THIS
I GET BETTER PE WHEN MY PH'S ARE GOING FULL TILT
BOUNCE SOME OF THE GLASS...
if i were you i would mod a MJ and put it in the middle of the tank under the center brace and just let the puppy slam into the front glass