I have two pengasius sutchi's and they seem to stop being active during the day, they just sit on the bottom of the tank untill i switch the lights off. One of them was startled three days ago and had a mad dash around the tank bumping into everything. He now just lies in the plants, he almost looks dead. I made the mistake of trying to scoop him out yesterday, he flew across the tank smashing into the glass and everything again. What can i do ? Are they poorley??