HIya!,
I love this guy. He has not grown in over a year. I have hermits and a sand sifter starfish. He doesn't bother them. However, he will eat any shrimp I put in there.
He has not become aggressive at all to his tank mates. Hiwever, he nipped at one of my corals yesterday for the first time that I have seen. He better not make a habbit of that!