I feed my fish half a cube of frozen brine shrimp twice a week, the other nights they get pellets. Tonight I actually sat and watched what the Mandarin did when the frozen brine shrimp went in (as usual the clowns went into a feeding frenzy).
The Mandarin sat at the bottom but was definitely snapping up whatever made it that low into the tank. I'll pay more attention to its behavior tomorrow when the fish get fed some pellets. Some of the brine shrimp made it to the bottom of the tank so I will be watching to see if the Mandarin goes around and cleans up as it swims around.
At night I have noticed a lot of bristleworms in the tank, so I am wondering if it feeds on them as well.