i currently am in the middle of setting up a 40 gallon reef, 1-3 weeks away from corals, any way i have a turn over rate at 856 gallons per hour, which is 21.4 times my water volume is turned over in my tank in 1 hour (still with me). I was thinking of adding another powerhead, running at 160 gallons per hour, this was to creat more water movement at the back of my LR, do you think i need it?