I have a 29 gal fugue 19in of it by 6in high is deep sand bed. What's the best fish or critter to keep it stirred, cleaned, and looking nice? I have a bunch of snails but I think I need someone a little bigger to do the dirty work. I'm going with the tube to clean bits here and there slowly but I'd like someone to do a bit for me. I'm waiting on the tube for a bit too cuz my phosphate is a little high right now.