Firefish dying??

[zhasan]

Hello All,

Today I came back home from work and check on my tank to find my firefish sitting low to the gravel. I quickly ran the vital parameter check and everything is good. NO Ammonia, nitirite or nitrate. PH is normal too.

After I was done with the test I noticed he was tying to swim but was not able to and started tipping on one side of his body and within about 5 mins he was laying on his side breathing heavily.

Anything I can do to revive him?

Any idea what could be the cause? I've had him for about a month and he has been active from day 1.