It is nesting behavior. A good thing!!
Depends. If you used soap to clean the bowl, it's a bad thing.
If not, your Betta has built a bubble nest. It's an instinctive behavior, it doesn't mean anything good or bad. It doesn't mean in any way that your fish is "happy", as some people tend to think.
On another note, keeping your Betta in a bowl is a bad thing. Bowls aren't proper homes.
No, that is not a bad thing. Your betta just made a bubble nest, which female bettas lay their eggs in.
Also, never keep your fish in bowls. Betta fish need at least a 5 gallon tank with a heater set to 78 degrees fahrenheit and a sponge filter. You also need gravel and live or silk plants.
It's normal beta behavior. He has built a bubble nest and it's breaking up so dip it out with a paper towel.
