A halfmoon trigger, wow nerver heard of that. Does anyone sell them? He is doing fine though, I just cleaned the tank and took off the background paper with a water change and I moved the rock, So hopefully that does not piss him off anymore than what he might be, My eel tried to bite me, butt I guess I was in his way. If you all have anymore information on the trigger feel free to respond. Oh I caught it with a net, in the phillipine sea side of the Island.