one of your biggest concerns for leakage is the type of hose you use. I suggest going to McMaster Carr
www.mcmaster.com and ordering some good silicone rubber tubing. The vinayl tubing tends to leak quite easy, as it is not nearly as flexable as the silicone tubing. Also its a good idea to pre-run the entire system for 24 hour before installing it on your hardware. Personally I have never had a leak, I have a server that has been running 24/7 for 11 months now without a problem.
~Buster