the BRS peristaltic dosing pumps? no you don't need an aqua lifter.
when looking at the unit, the left side is the input, the right side is the output. so place your airline hose from the left side of the unit in to your dosing reservoir, then run the tube from the right side in to your sump where you want the dosing to go.
they have a few instructional videos:
http://www.bulkreefsupply.com/brs-2-part-doser-1-1-ml-per-minute.html