Clown fish breathing heavy sitting on bottom

[usc_lax9]

I have a pair of clowns that have been in my tank for over a year.. About a week ago my female started acting strange and look lethargic and seemed to be breathing heavier than normal. She had stayed about the same for a week until today I noticed she was laying propped up against a rock on the bottom.. I did a water change earlier today before she started laying on the bottom.. I don't think anything from the water change could have caused the issue since she has been acting like this, just not as bad, for a week.. She also seems to only lay in the same spot because occasionally my flame angel will harrass her so she has to start swimming again.. She will. swim for 5 minutes or so before laying back down on the bottom in the same spot. No signs of illness either.. Any help will be greatly appreciated..
Params:
Ammonia-0
Nitrate~0
Nitrite-0
Ph-8.
Temp-78.3

 

[michellejy]

Have you added anything to the tank recently?

 

[usc_lax9]

A tomini tang but that was 2 weeks ago

 

[LetItReef]

Eating regularly?

 

[usc_lax9]

Eating regularly?

Early last week yes but lately no.. He didn't eat mysis yesterday or pellets today.

 

[usc_lax9]

Hopefully he makes it through the night but I'm not to optimistic.

 

[Humblefish]

Any other fish acting weird?

 

[usc_lax9]

No everytime else is fine. He didn't make it through the night the crabs got to him.

 

[usc_lax9]

Should I be worried about my other clown as well?

 

[Humblefish]

Should I be worried about my other clown as well?

Not enough info to determine if the death was caused by a disease or some other issue. If I were in your shoes, I would just keep a close eye on all your other fish for now.