Thats really tough to do because half the time you can't see it all, but I'm having great success with 2 peprmint shrimps and a saddleback butterfly fish....
Pepes take care of the small ones and saddleback has finally decided that he like aipstasia more than my blue clove polyps.. 
He did take after those for the first few days though. But now he eats flake like a pig and has been going after the aipstasia....
That being said there is still the very real chance that stuff will be lurking where they can't get at it...
plumbing...
overflows....
return areas of sump, etc
So unless one take matters into their hands to eradicate all they can see, it can still come back....
TJ
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75G, 100 lbs LR, Inwatter Stingray LED's, 25 Gallon Sump, 24wt UV, hermits, Snails, pep, fire & cleaner shrimps, Blue Throat Trigger, Perc Clowns , Yellow Tang, Coral Beauty, Blue Regal tang, RBTA, Coral Banded Shrimp, Checkerboard Wrasse, Many Corals, Royal Tux Urchin
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