I am getting an asm g2 with my tank, I am going to replace the pump so I was wondering if I should go with the sedra3500 or the sedra5000 and if I do go with the 5000 will it work better?
IMO the 3500 should be fine. It is the standard pump that comes with a G2. I would go ahead and do the impeller mod on the 3500 and save some money. I have done the mod on my G3s with 5000s and it does make a difference.