hello everybody!
i'm new here and i'm setting up my 180gal again for reef. which would give me enought circulation and low wattage for my 180 gal tank, would 6 pcs of seio620 or 4 pcs of seio820? these two models are the only seio pumps available here. electricity here in the philippines is becoming a burden on my pocket. hope you guys can help me out.