Is this fungus?

[Scorpio99]

Have you tested your water?

No

If I did not test my water...

...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?

31-40%

How frequently do you change your water?

Every week

If I do not change my water...

...I recognize that I will likely be recommended to do a water change, and water changes are critical for preventing future freshwater health problems.

 

[kno4te]

Little hard to make out but looks like scraped up slimecoat.

 

[tlindsey]

I agree with kno4te looks like Firemouth scraped itself possibly on something in the aquarium. Does the scrape resemble cotton?

 

[Scorpio99]

I agree with kno4te looks like Firemouth scraped itself possibly on something in the aquarium. Does the scrape resemble cotton?

Yes the white part somewhat looks like cotton.
Here's another picture, very hard to photograph the fish
kno4te

 

[tlindsey]

Yes the white part somewhat looks like cotton.
Here's another picture, very hard to photograph the fish
kno4te View attachment 1424391

If possible isolate and treat with salt.

 

[tlindsey]

If possible isolate and treat with salt.

1 tablespoon per gallon.

 

[kno4te]

Yes the white part somewhat looks like cotton.
Here's another picture, very hard to photograph the fish
kno4te View attachment 1424391

If it’s cotton like then agree with Tom. Cont with salt and water changes. Should go away.

 

[kno4te]

If possible isolate and treat with salt.

1 tablespoon per gallon.

+1