Can you post some pictures of the fish so we can assess their condition? If the tank where the fish came from had ich, your fish are carriers of the parasite, and should be treated prophylactically. From our own Humblefish:
https://www.reef2reef.com/threads/ich-eradication-vs-ich-management.188775/#post-2171424
Suggested treatment for ammonia burns:
Malachite Green/Methylene Blue: Treats ammonia burn, cuts, injuries.
How To Treat - Comes in both liquid and powder form, sometimes mixed in with another medication(s). So, follow the directions on the label. Best used as a 30 minute bath solution, but you also can treat with it in a quarantine tank. Aerate heavily. If you are using it in a bath solution, then it is also a good idea to treat the fish with nitrofurazone (active ingredient found in
Furan-2 and
Nitrofuracin Green Powder) once he is returned to the quarantine tank. Nitrofurazone is great for treating open wounds or sores.
Pros - Highly effective.
Cons/Side Effects - Depletes oxygen from the water. Malachite Green is considered “harsher” on fish than Methylene Blue.
Here's another product that is used in the industry to treat fish fresh out of shipment. It appears to be very good at treating ammonia burn and any sores from the rough treatment during shipping:
Nitrofurazone: Treats open wounds or red sores.
How To Treat - Nitrofurazone is an antibiotic, and an active ingredient found in
Furan-2 and
Nitrofuracin Green Powder. Nitrofurazone is great for treating open wounds, and especially those “red sores” commonly seen on butterflyfish and some angelfish.
Pros - Highly effective; found in a number of bacterial disease medications
Cons/Side Effects - Appetite suppression; it has been discontinued in the US (for human use), which may possibly affect its availability for the pet industry.