Serial killer fish in your tank...what triggers them?
I kind of wince when I hear the phrase 'showpiece fish'. Most tend to be of a pushy species, and if you don't give them enough room...your other fish start disappearing. They don't even have to be that huge a fish---if your tank size makes them feel cramped, they just start adjusting the aquarium population until they feel calmer in the traffic flow. Your other fish, in a healthy tank, just start not reporting for feeding. Sometimes you'll...