My aquarium is running well right now but I see a line of brownish junk in the sand, right against the glass. I have about 30 Nassarius Snails in there now who are not getting it. I am just wondering if you guys and gals think i should just grab more snails or if you have experience with another sifter that keeps your sand nice and clean. I am looking for an invert but will think about a sifting fish if you think that is the way to go.