Tiger tails are awesome and one of the best sand cleaners. Skip sand sifting stars as they consume the microfauna that actually cleans and keeps your sand healthy. Fighting conchs, nassarius, bristle worms, mini brittle stars, spaghetti worms, etc all help clean your sand bed. I started with one tiger tail (like Eric) and now I have 3. Sand beds can be tricky and people's definition of them range drastically. If you really want to take the deep dive into actual DSB, then read articles by Ron Shimek. I like substrate in my display (less than 1" of sand) and an actual refugium in the sump or a remote DSB. If you have more than 3" of sand in your display, then you don't want sand sifters at all.