I have a lot more than a hundred at the moment and they've been a part of my tank's ecosystem since 2004. The only issue I've ever had with them is that I've been stung a few times which for me has been about as bad as a mosquito bite. Because of the bristle worms, mini brittle stars, stomatella snails and other varieties of smaller snail I nearly have tank that manages without a store-bought cleanup crew. In fact all I have that was store bought is a cucumber, two abalone, a limpet and an astrea in a 230gal system.
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