Hey, not sure why I am sharing this but felt the need to tell someone... my much loved channa stewartii killed himself lastnight by jumping out of the tank and hitting the roof so hard he died... not sure of the direct cause as he has been in the tank 1.5 years with no sign of injury or infection. He gets a cooler period over winter and warmer for summer, tank was 29 degrees as we have had a bit of a hot spell (yes we do get them in the UK!) but every else in the tank is fine! He was about 10 inches and built... so sad.