The density of a fish is much smaller than the density of water, therefore the fish does not sink, but it should float. The only thing that keeps the fish from floating to the surface are their swim bladders. They are organs inside the fish that contain gas to balance out the density of the fish and make the fish achieve neutral buoyancy and stay in the water.
Unfortunately, I believe it's time to replace the fish.
It is recommended to change the water in a fish bowl at least once a week to maintain a healthy environment for your fish.
put the live fish in a bag filled with water and change the tank then put the fish back in.
You should change the water in your fish tank every 1-2 weeks to maintain a healthy environment for your fish.
environment and topography
By moving water.
yes bubbles help bring air to the fish and keep the water moving
They are used to propel the fish through the water, and in some cases they are used to keep water moving through the gills!
well if its cold water fish then 3-4 days :)..
You should change the water in a fish tank regularly, typically every 1-2 weeks, to maintain a clean and healthy environment for the fish.
by wearing away small pieces of land and carrying them to new places
To change your fish tank water without harming your fish, follow these steps: Use a siphon to remove about 25-30 of the water. Use a water conditioner to treat the new water before adding it to the tank. Make sure the new water is the same temperature as the tank water. Avoid sudden changes in water parameters. Monitor your fish for any signs of stress after the water change.