After I posted I thought of the same thing. I'd stick to females, they have smaller claws and are more timid than males which would attempt to establish territories, show off their big claw, etc.
Get one fiddler female and see how she fares. In a 10g you can have 2. But for a clean-up crew ... I dunno. They are messy eaters. Why not some acclimated ghost shrimp? Would the gobies and glass fish be a threat to them? They sure as heck would be a lot more efficient and dilligent at eating the small leftover food. With the fiddlers you also want to make sure you have a spot outside the water where they can dry off.
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