Banggai cardinal laying on his side and breathing heavy

[Icky Nicky]

Woke up and found this guy laying on his side and breathing heavy, all other fish and corals acting fine, ammonia and nitrite are zero, nitrate is 10, hydrogen peroxide was used about 3 days ago and corals were glued yesterday. he's part of a mated pair and the other one is acting fine, any ideas?

 

[LAReefer4Life]

More information would be helpful. Has there been any new additions? How long have you had this fish? Have all fish been QT'D? Why were you using hydrogen peroxide?

I would also post a video under white lighting of the fish to verify how quickly the fish is breathing.

 

[vetteguy53081]

Woke up and found this guy laying on his side and breathing heavy, all other fish and corals acting fine, ammonia and nitrite are zero, nitrate is 10, hydrogen peroxide was used about 3 days ago and corals were glued yesterday. he's part of a mated pair and the other one is acting fine, any ideas?

These guys are active all night and startle very easily and may have crashed into object. Another possibility- Is it carrying eggs in its mouth?
Peroxide is an oxidizer and could have caused adverse effect even without others affected.
Fish appears to be moribund which is similar to a comatose state and may not be able to swim or eat in this state and may not make it to prepare you for the worse