Hi 👋 everyone. New to the fish keeping ling hobby. Have a 180l tank set up with 7 rummy nose and 4 black phantoms at present. Last night I had my lights off and when I returned from work turned them on to check things out and the fish were acting off and fairly lifeless at the bottom of the tank. I did a water chekc and ammonia Nitrite and Nitrate were all fine. I went to bed and woke up today and they were all fine acting as normal. Then iv been out today and a similar thing happened. Iv came home and they are all just either hiding out in the plants or floating along the floor of the tank. Is this normal for them in darkness or should I be worried something is up?