I have a silly question. We have a premade waterfall (made of resin I believe) that we're trying out (first pond). I want to have the filter a little ways away and was thinking of running hose from the filter to the top of the waterfall, which seems feasible. My question is, how do I keep the hose in place at the top of the waterfall? Just rocks, or something else? I'd hate for it to come loose and empty my pond by spraying water around...