so this might not be the best option when its more fun to buy a new pump but the pump on my ER250 would go through an impeller a year, they were sedras even though the pump was a gx6000. I would buy the sedra 9000 impeller, yard off the regular impeller and put the needlewheel from the old impeller on. Worked like a charm until this year when I don't know what the hell happened. The pump is dead now though so that could be part of the problem. Anyway, might be worth a try? J&L sells the sedra 5000 impeller.
My brain almost exploded trying to fit a new pump to my ER (bubble blaster, sicce arrgh which one? how much diy to do?) so I just bought a new one from reefdynamics, it just seemed....easier somehow
