In polich website is not enough information about channas. I don't know do i whright , but in my opinion (obserwations) I saw thah the fisz i more colorfull, when the light is thurn on for 12hours per day. In my previously tank , when I wet to a holiday channa was more darker, and the bhright strip alon his body was almost invisible, body was homogeneous. I have returned and I have tyrned on light , and micro recovered colours.