well, its a jack dempsey cichlid, about 1 year old...just added to the tank, but the tank was made just for him....it becomes super active when the light is off, and the pleco as well...but as soon as the lights come on so i can enjoy my aquarium, they freeze dont do anything. i try to leave the light on as much as posible, so they might get used to it but over the past week it just hasnt worked. 55 gallon tank.