I have a 24 Gal
Nano with 2 clown, one purple/yellow damsel, one red scooter goby and a firefish.
The firefish has been in the tank about 1 month and was doing fine. Today I found him on the floor of the tank, thought he was dead. He started swimming but then laid on the rocks. It looks like his tail is decaying (or being bitten?) I put him in an isolation tank ( a guppy fry tank) inside the aquarium so no one will bother him. He is still laying on his side, breathing heavily. Water's tested good, no amonnia, or nitrites. PH 8.4 alk
1.25. Is he sick? Could the damsel have bitten him (he can get territorial but has not been chasing anyone while i watch. I don't want to risk the other fish getting sick. Is there anything I can give him to help him? I did put a little stress zyme in the water today.
Thanks for any help anyone can give me. It really hurts to see him suffer.