well im surprised after i put some heating device for my fish they start making bubbles.
my veil male made good amount of bubbles about 4x4 inch amount of surface.
and i keep hearing clacking noise.
at first, i thought someone scratching the glass... later on i found out it was him making clacking noise (like when you clack glass and spoon together) and his gills were open close, open close when he makes the noise.
The only time I've ever had a betta make a noise it was sort of a *bangplop* and when I would turn to look he was just sitting watching me. Finally one day I caught him in the act of jumping out of his tank, banging his head on the hood and plopping back into the water.
Are you sure it's the betta and not the filter/aerater/heater?
If it is the betta I would love to see some video of this. It would be fascinating.