Originally Posted by nemo's dori
Yes, I have read that they can eat brittle stars, some smaller fish, hermits and snails. I found one in a newly purchased live rock after several days. I read everything I could on what to do about them and the majority said to get rid of him. Most people that tried with different traps didn't sound like they had much luck so I decided to do the freshwater dip. This rock does have a lot of barnacles on it, too, so I was afraid it might hurt them, but they all made it through just fine. Now the mantis wasn't as lucky. I'm glad I did it that way though because I ended up finding several more little ones in the bucket after the dip. It, also, helped me get rid of many bristle worms. That was about a week and a half ago and so far, so good.
IMO, it was either them or my hermits, and I love my little hermits. Sorry!