I've got 2 in my 45g Reef tank and they're fantastic, I've never supplemented and I've seen them THRIVE. They feed off of algae and detrius.
The key is to keep the salinity at a regular level, and make sure things are "stable" in your tank. Once you do that, you'll be good to go! If I had more room for extra bioload, I'd add one into my Nano, the wife'll be getting one for sure, they're just fabu.
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