white on rainbow shark, but not white spot

[Crono]

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 two weeks

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.

should I be worried? what is this white color on its body?
I search with ai about it. not white spot, possibility fungal infection.
search google about it... not the same?

 

[kno4te]

Hard to make out. Looks like missing scales.

 

[Deadeye]

I’d agree it looks like damage from an injury - what are the tankmates? Any sharp edges for it to injure itself on?

 

[Crono]

bichir, gar, and pleco
decoration, that black that I turn into a cave, and rocks.

well, it's also a new fish from buying, already there upon arriving
(I order a snakehead and a eel, not them!)

alright, thank for the info. these can 'clear' with good water & aquarium salt I suppose?

 

[kno4te]

bichir, gar, and pleco
decoration, that black that I turn into a cave, and rocks.

well, it's also a new fish from buying, already there upon arriving
(I order a snakehead and a eel, not them!)

alright, thank for the info. these can 'clear' with good water & aquarium salt I suppose?

Should clear with food and clean water. Don’t need the salt but can add it.