Just a weird clownfish or something wrong?

[Sitthanon]

So I've had my two clownfish for about 10 months, the male have always been somewhat weird, at night he swims at the surface and blow bubbles. a few weeks back he started to make poping sounds when he's at the surface blowing bubbles. he eats really well with mixed diet, mostly a mix of diffrent frozen stuff. dosn't breath heavily, have lots of surface agitation and a skimmer. when I first noticed him at the surface I added a bubbler for a few days, he didn't stop.

anyting I can/should do for him? or is this just a clown being a clown?

KH: 9
Calcium: 420
magnesium: 1350
nitrate: 2.5
Phosphate: around 0.01-0.02 (hanna checker)

 

[Thaxxx]

You have it correct.
Probably just weird, and or they are matting now.
Clowns just do weird stuff.
As long as he looks good and is eating good. He is probably good.