I have a little Rio 200 water pump which I use to direct a flow of water over an emergent piece of fake driftwood in my paludarium. It's getting pretty annoying, because it becomes clogged with strands of brownish algae every few days and has to be turned off and removed while I clean out the vinyl tubing and 90 degree plastic angles attached to it, plus clean its impeller. It's not located very close to any plants and is suspended about an inch above the substrate. Is there anything I can do to increase the interval of good operation before it goes to a little dribble again? Thanks.