Fox Face blowing bubbles???

[grumpygils]

Has anyone had a fox face or other fish that blows bubble. About every 5 minutes my fox face points straight up to the surface and sucks in water and it bubbles (large) out of his gills. He will do it for about 10 seconds then cruise on. There is no lack of O2 in my tank. Skimmer, PHs, fuge and frequent water changes. I am going to get my O2 tested anyway and was wondering what a preferred range is?
:notsure: :notsure:
Mc

 

[xdave]

Yeah, that's a new one. If I were to guess, I'd say it's more likely that you have more O2 than he's used to.