ATO pump recommendation

I added a JBJ ATO to my cube a few months ago. Have been using the aqualifter with it. Lately I've been having problems that the JBJ shuts off (which is correct) after a certain length of time. Problem is not the ATO but the aqualifter. The aqualifter is only recommended for lifting up to 30". Its 45" from the bottom of my refill bucket to the aqualifter. Based on room constraints, I don't have an easy way of getting the bucket lifted up higher so that I have a pumping distance less than 30". So, I'm looking for a replacement pump recommendation. ???????