Scavengers needed

#1
I'm looking for a scavenger fish that eats leftovers like crazy and could go in the same tank as 2 5 in. oscars, 2 peacock eels, 1 fiddler crab, and 1 pleco. I'm thinking a couple of pictus cats or clown loaches. I was thinking about corys but they're too small. I also need something that can defend itself but not aggressive cause my eels are lovers, not fighters.
 

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