Even though I have 5 pumps and a twin overflow outlet on my tank I am still not completely happy with the water movement. 3 pumps are "Hagen 802" powerheads and 2 are just ordinary pond pumps. the Tank is 1500X800x700, Marine.
My question is are these Hagens sufficiently powerful, is there sufficent pumps in the tank and should I dump the pond pumps and put in additional powerheads.
If additional powerheads what size please.