Wow! Thanks for the replies! So there has been about a month since the original post, and I did pick up a second brittle a couple of weeks ago. Based on the replies I feel pretty good about that. This tank has messy inverts that like meaty food. I wanted brittle #2 to help clean up. Since there is a mantis in the tank, most of the traditional options are out. The rock is also literally crawling with pods, which I am sure that brittle can sweep up when they get too close. Between the rocks, the seaweed and the food constantly raining from the sky it's a pretty swanky house if you're a starfish.

@Polarbear: brittles can and do eat fish. The greens will do it just because, but all of them will take down Nemo before they starve. Don't let them fool you when they just sit there. They can move very, very quickly.