terror in my tank

[reefhawk]

Well I woke up this mornin my midas goby was dead. (sounds like an old country song). Now I am not only sad but ****ed off. Tried the pop bottle trap but to no avail. How big should the opening be? Any other ideas? Thought I would bait the trap with the remains of the goby. Is that too cold? He really was one of my favorite fish.