The only bad thing about bristleworms is you gotta be careful about diggin' about in the reef with bare hands! Ouch! I still have Ma'adib, my 12"er. He is totally cool, especially when I feed him shrimp pellets-he just engulfs them like a five year old suckin' down gummybears. I've never had a problem with a bristleworm in my tank yet.....unless you count the swollen fingers from gettin' too friendly with 'em!