Walrus.. .they are EXCELLENT at getting into the tiny nooks and crannies of
live rock and pull out left over foods that fish and other clean up crew can't get at. Again, they typically forage after dark and that may be another reason why you don't witness any beneficial activity from them.
Dreams...remember it is the Sand Sifting Stars that I'm talking about when saying that they will wipe out a sand bed. While serpents do eat some sandbed fauna, they aren't as agressive as the true sifting stars. If you ARE referring to sifting stars, then I say that your 110 couldn't hold more than one without resulting in sterile sands, void of microcrustaceans etc. Do a google search or check wet web media for some more information. They do need a lot of square footage of live sand per specimen.
Sand sifting stars can't possibly catch all of the faster moving pods and mysid in a system. They just aren't fast enough or tricky enough. They do eat other things in the sand though. If you have a
fuge or can keep up your pod populations, you should be okay with a mandarin or other dragonette. Especially if he/she begins to eat prepared foods in due time. My twin spot goby took two weeks, but now eats frozen.
Your star may be staying where the food is presented because the scrap foods may be attracting other life that the star likes to eat. In any case, you will see, that is it
acclimates to your tank, over time, it will work many areas of the tank, in a cycle.
Dave
USA 
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