Ensure that you have not added anything to the tank that may have soap residue on it including your hands. Otherwise if you have used a product called Melafix, this can cause bubbles with aeration.
Fish tank filters provide oxygen to the aquatic environment by creating surface agitation and water movement. This helps to oxygenate the water by allowing for gas exchange at the surface, where oxygen from the air can dissolve into the water for the fish to breathe.
The film on your betta fish tank is likely due to a buildup of oils, proteins, and other organic materials on the water's surface. This can be caused by overfeeding, lack of water circulation, or inadequate tank maintenance. Regular water changes and surface agitation can help prevent and remove the film.
Some fish are surface fish and others are not. Without you saying what kind of fish it is that is at the surface it is impossible to say if anything is wrong. BUT! if the fish are breaking the surface and gasping for air, then you have a major water problem and need to do some very large water changes immediately. Otherwise your fish will die.
Foam on the surface of a fish tank can be caused by protein buildup from excess fish food, waste, or decaying plant matter. It may also be due to inadequate surface agitation, leading to poor oxygen exchange. Regular water changes and proper filtration can help alleviate this issue.
You can tell if your fish tank has enough oxygen for your fish by observing their behavior. If they are swimming near the surface gasping for air, it may indicate low oxygen levels. Additionally, you can use a water test kit to measure oxygen levels in the tank.
They associate the vibration in the water made from you tapping on the tank, to the vibration felt when the food hits the water's surface. Just a theory.
Male Bettas make bubbles on the surface of their tank when they are wanting to breed. The water should not be thick though. Maybe you need to change some water and also clean the tank out.
Salt Water Fish
Assuming the dirty fish tank has had fish and water in it, without doing various specialised water tests it is impossible to tell what is in it.
It might be unsafe to drink because fish food, fish scales, fish waste, and many different kinds of bacteria are in fish tank water.
To change the water in a fish tank effectively, follow these steps: Use a siphon to remove about 25-30 of the water from the tank. Use a water conditioner to treat the new water before adding it to the tank. Gently pour the treated water back into the tank to avoid stressing the fish. Repeat this process regularly to maintain a clean and healthy environment for your fish.
The purpose of an aerator in a fish tank is to increase the surface are of the water next to the oxygen source to allow a more efficient transport of oxygen from the air to the water for the fish to be able to breath. A few large bubbles have less overall surface area than many small bubbles.