I've read a bit about them. They are hard to keep because they only filter phyto that is 40microns. No bigger no smaller. And they need to be fed everyday. Apparently most only last 4-6 months before slowly starving to death.... 
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Gerald
Home:160Gal. Foxface, Yellow Tang, Blue Tang, Coral Beauty, Lawnmower Blenny, Starwberry Dottyback, Mandarin Goby, 2 Percula Clowns, Green Brittle Star, Brown Brittle Star, Chocolate Chip Star, Cleaner Shrimp
Store: 33Gal. Green Brittle Star, Chocolate Chip Star, Peppermint Shrimp
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