@Daisykd: I'm sure you have seen people post bubblenests everywhere! I've posted a few as well. Bubblenests can mean more than one thing/s.
Yes all Male bettas CAN (some choose not to) make bubblenests.
The meaning of the bubblenest really does depend on how the betta is. For ex. If a betta is kept alone and has no view of a female or male betta and they still build bubblenests, is because they are contempt with their environment. Not happy because fish do not have feelings like humans/dogs/other higher species do.
If the male is kept in a divided tank with a male or female, he might build a nest. If it is a male that he is divided from, he is building it because he is "over excited" and usually bettas only build nests out of excitement. Not excited in the "happy to see you" kind of way, but "hyper" if you will.
If the male is divided from a female and is in view, he will be building it from excitement and the desire to spawn with her. You see male and female bettas put out a chemical in the water that tells the other that they wish to spawn. They will do this often, but just because a male builds a nest for a female and you see her belly full of eggs, doesn't mean you have to release her to him and give them what they want. (Especially if you aren't prepared to care for 50-70+ fry at times.)
I hope I have helped! Good Luck!
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