Is it normal for male betta making a bubbles nest? There is no female betta in the tank, just one male betta. What do I do with bubble nest? Do I leave it alone, or do I vacuum it up with my hose?
They build a bubble nest when conditions are good and the fish is in breeding condition.
Don't damage the nest, just leave it be. The male spends a lot of time making it and having someone come along and remove it doesn't help them. It might get broken up when you do a weekly water change, that happens, but don't deliberately remove it every day.
To add to the other comments, males make a a nest TO ATTRACT a female so making them without a female in the tank is very normal. You can do what you want with them but consider the fact that its part of the fish's persona, what kind of emotional damage you may be doing by removing the nest.