Why are my angelfish staying at the top of the tank most of the time that my tank light and bubbles are on but when I turn them off at night they usually come down to the bottom?
If they're gasping for air, your aquarium may contain ammonia or other toxins that burn their gills. Angelfish normally become inactive at night.
If you have access to an aquarium water test kit, check for ammonia and nitrite. Both should be zero. You can learn more by typing nitrogen cycle next to the SEARCH button. Please keep us posted.
Most angelfish swim during the day and at night they go to the bottom of the tank to sleep unlike other fish.