clean up crew for stingray tank?

[klwheat]

In my continuing quest to get this thing up and running...I have questions...lol. Well, as the title says, I'm trying to figure out what I can put in with this ray. She's a California Round Stingray. I'm planning to get it set up this weekend, start the cycling with live rock and water from another system or 2, and maybe a couple chromis that will eventually become Slimer (my ray) food. However, I want something to keep the sand/tank clean. What can I use that won't become a snack?! Thanks!