I hooked up a ATO system for my 20 gallon tank. I have a Aqualifter pump but it's at the limit of it's lift...36" The water just barely comes out. The pump is 2 years old so I took it apart to check out the diaphragms. They look to be in good condition. I'm thinking the pump can't handle that much lift. What's a good pump to use that won't come out like a fire hose ?