I recently bought a python hose and i am really enjoying it. The distance between the tank and the tap (it's a bathroom sink) is about 37 feet, so I bought the 50 feet model (my wife really didn't like the kitchen sink being used to clean the tank). I found that the python doesn't manage to pick up the gravel in order to actually vacuum it, as a result a lot of debris stays in the tank. My only assumption is that maybe the hose is too long and does not manage to create the strong suction needed (too many loops on the floor). Anyone encountered such a problem? Any feedback welcome!