I have a 185 gal Mbuna tank. One of my fish is a demon(Red Zebra). I have tried for weeks to catch this fish to no avail. The tank is loaded with Texas Holy Rock and it is extremely difficult to maneuver a net around the tank. I have been keeping tropical fish for around 35 years and never had such difficulty catch a fish. Does anyone know any secrets to catching a difficult fish without breaking down the tank which is not an option.