Originally Posted by cogburn
hmmm... thats an interesting one... with such a small water volume (30 gallon)
It is not the volume of the tank. The canister only has to move the amount of water in the hose itself from pickup to return. It would take the same amount of force wether it is 10 gallon tank or 1,000 gallon tank.
That said I only have experience with one canister and that is limited. My Fluval 405 instructions specifically says that the distance from the canister to the top of the tank must not exceed 48"