Also, beware of the green brittle star. Anywhere you read on them, on the web or in book form, will give you a warning on the "green fish eater". They have been known, quite commonly, to eat fish. Although I do believe there are a few people on this board whom have had them and not had problems, there have been people who have.
This is what wetwebmedia has to say on them:
"One species in common use warrants a statutory warning. This is the Green Brittle Star of the genus Ophiarachna. This animal is a predatory fish eater, that does indeed do a spiffy janitorial job when small... but grows quickly, and under darkness of night can/does learn to eat aquarium fishes. This species has been documented to arch up in "sleeping caves" of captive fishes and drop down on unsuspecting meals. If you use this species, keep an eye on it, and a count on your piscine livestock."
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