bubbles in my fishes bowl?

When betta fish breed the male makes bubble nest for the female to put the eggs in, it is common for a betta to do this even if there is no female so dont worry and enjoy your betta.
 
ok so recently I got a beta fish (fighting fish) and i have a regular fish bowl, enough room for him to move and everything and at the top of the top every time no matter how many times i change it a huge patch of bubble gather at the top and just stay there then get bigger.. any idea why?
 
When betta fish breed the male makes bubble nest for the female to put the eggs in, it is common for a betta to do this even if there is no female so dont worry and enjoy your betta.
 
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