IIRC, the Iwaki 20RLZT has a 21' cutoff.

i use a gen X 6000 pump the output is reduced 1/2" and using 1/2" vinyl hose it travels up about 10' and it rocks. it will empty about 25 gallons in about 5 minutes. i also use this pump to mix the saltwater as well. i just hook the hose to it when i'm going to do my water change