I have a serpant star in my tank, they are very hard as I have abused mine in 3 rather fast new acclimations in the past. They won't clean your sand bed very well but will probe into every corner of your rock bottoms to find every last bit of food and deteris. Great scavangers and seem to leave all inverts and fish alone, just avoid green brittle stars as they have been know to go after sleeping fish.
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