Spot on oscar under chin

[jason longboard]

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?

25 ish

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.

Noticed this spot under neck for a few weeks, hes about 4 inches.

All my years with oscars dont recall seeing this, doesnt look fungal, just looks like a raised spod of scales, any thots

 

[kno4te]

Maybe some raised scales. Does it lay around a lot? Clean water and make sure it’s eating. Hope it’s enough to make it go away.

 

[duanes]

To me, a 30 to 40% water change once per week, is quite lax, and the 25 ppm nitrate concentration is an indicator of that,
so unless you intend to double or triple the amount of water changes and volume, there may be more serious maladies to come, on down the road, such as HITH.