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.
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.
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
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.
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.
Live Aquaria provides you with supplies to preserve a fish tank with salt water fish. Fish tank provides lighting, fish food, and more to help you maintain your salt water fish tank.
Surface area, is used to paint a house or wrap a present and volume is used when you need to know how much water to put in your fish tank or water bowl
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Cause its dead
The white scale on the inside of the fish tank is from a buildup of minerals that were in the water.