northern_monday
New member
The fish you have aren't known for fin nipping. Could be fin rot, which basically rots away fish fins. Take a close look at the others for signs of this.
The bag isn't really a good idea, that will just stress it out more.
Another possibility is that the fish has caught it's self on sharp objects in the tank, fighting fish love hiding in plants, and can easily rip fins on plastic plants.
Good luck
You should put the fish back in the tank, do a water test to make sure everything is how it should be: Ammonia 0, nitrite 0 nitrates under 20pp, maybe get some fin rot med from the fish shop, take a photo of the fish to the shop with you, so the people have a better idea of what might be wrong. Also check out your stocking levels, make sure you have enough room for the fish you have.
ADDED:
not sure what a glass fish is, but I've never had problems from angles nipping.
The bag isn't really a good idea, that will just stress it out more.
Another possibility is that the fish has caught it's self on sharp objects in the tank, fighting fish love hiding in plants, and can easily rip fins on plastic plants.
Good luck
You should put the fish back in the tank, do a water test to make sure everything is how it should be: Ammonia 0, nitrite 0 nitrates under 20pp, maybe get some fin rot med from the fish shop, take a photo of the fish to the shop with you, so the people have a better idea of what might be wrong. Also check out your stocking levels, make sure you have enough room for the fish you have.
ADDED:
not sure what a glass fish is, but I've never had problems from angles nipping.