great john well, on witht he quest, i checked out litermeter's site, and did some reasearch on those pump, with a litermeter we still have to get two pumps, because the litermeter III comes with only 1 pump, also the litermeter is the same medical pump build into it, it still uses a roller and a tubing like the rest of the medical pump. but people have been reporting that they have been using the same tubing on the LTMIII for over 4 years and have great results im guessing we only need to get good quality tubing. Im gonna ask the medical reef doser guys about their pumps.