Being new to betta keeping and upon reading articles about bubble nests, some say it is the sign of a healthy betta. While others say not to worry if a betta doesn't build bubble nests at all. Other articles say it depends on their personality, some build nests others don't. Mine does not build bubble nests, and he is happy with a curious personality. I play with him by placing my finger up against the glass, he swims up to my finger flares up swims away, swims back etc.