Is this fungus or part of the healing process?

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Oceangold

Feeder Fish
MFK Member
Jun 17, 2025
11
5
3
USA
Have you tested your water?
Yes
If yes, what is your ammonia?
0
If yes, what is your nitrite?
0
If yes, what is your nitrate?
10
If I did not test my water...
  1. ...I recognize that I will likely be asked to do a test, and that water tests are critical for solving freshwater health problems.
Do you do water changes?
Yes
What percentage of water do you change?
21-30%
How frequently do you change your water?
Every week
If I do not change my water...
  1. ...I recognize that I will likely be recommended to do a water change, and water changes are critical for preventing future freshwater health problems.
Hi everyone,

One of my fish got its fins bit by another tank mate around 5 days ago. I removed the other fish and have been monitoring this one. I looked today and see this on the fishes back fin. I’m having trouble determining what this is, and what the recommended treatment should be if it is fungus.

Thanks

IMG_4733.png
 
Hello; If you have a small empty tank or jug, maybe move the damaged fish into such. Generally, only have a bubbler in the bare container.
I generally try methylene blue when I suspect fungal problems. Most fish have tolerated it well.
Most times I isolate the injured fish rather than the aggressive one, but such is more personal preference rather than a guide.

Good luck
 
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skjl47 said:
Hello; If you have a small empty tank or jug, maybe move the damaged fish into such. Generally, only have a bubbler in the bare container.
I generally try methylene blue when I suspect fungal problems. Most fish have tolerated it well.
Most times I isolate the injured fish rather than the aggressive one, but such is more personal preference rather than a guide.

Good luck
Click to expand...

I had an empty aquarium still running so I was able to move him in there. I was able to go to my local LFS and was advised to use salt and methylene blue. I researched that around one teaspoon per 10 gallons of methylene blue is a good dosing amount, and I put in half a cup of salt. So 2 teaspoons and half a cup of salt for a 20 gallon. I’m planning on doing a 50% water change per day, while dosing half of the original amount, so an additional teaspoon of methylene blue and 1/4 of a cup of salt after each water change. Do you think that’s a good game plan?
 
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