I had 2 for about 1.5 years. They never bothered anybody. Their arms were about 8 or 9" long. Then one day I came up missing my 2 damsels. Hmmmm. Next week no percola. Next week Flame hawk. I thought they were just dyeing and I couldn't find them. Finally after loosing about 6 fish, (and no shrimp BTW) the light bulb came on and I remembered having seen one of the nasty buggers all swelled up a week or 2 earlier. I thought he was sick and dyeing. Now I know all he needed was alkaseltzer. I won't say what he got instead.
