Okay, I have a 10 gallon tank with black sand.  It came with a Whisper 50 Filter.  I don't have any fish in this tank yet.  I have Estes Marine Sand, which I heard is not a very good sand... but anyway, here is my question.  I was thinking about getting a new filter that wouldn't break because of the sand.  I don't really know what type of filter it is, but I was thinking of getting one that is inside the tank, and releases air bubbles.   Or is there something I could do that wouldn't invlovle buying a new filter?