I have set up my 10 gal tank with white marine substrate for African Chilids which I read is ok because they like high PH and hard water. I washed the sand throughly and the tank seems to be doing great along with the fish with the exception of the filter. I have tried 2 different types of filters and both start making noise because sand end up getting in the filter. The one I have had the most success with is the bio wheel style filter. However it does end up making a lot of noise after a week or so until I clean it. Does anyone know if there is a type of grease or something that I could get for the water intake assembly in the bottom of the filter? It is a little rod with a magnet on it and a paddle wheel looking piece on it. Or if not do you know a filter for a ten gallon tank that would be better for this? Thanks for any help given.