I have a question

[tuongericdoan]

Fish loosing scales??
So i have a goldfish about 5-6 inches long looks like a feeder that survived from a year ago or so but anyways i noticed that a lot of his scales are missing, he acts normal he still has his daily routine of picking up every single rock in my 135 and spitting it out so i dunno what to think! any thoughts and yes all water parameters are normal.

 

[FreshyFresh]

What else is in this 135g tank with the goldfish? Could it be damage from bumping into objects? Also, I'm not sure what normal is with water parameters. We need a number in PPM for ammonia, nitrite and nitrate levels. Hopefully you're doing regular water changes to keep nitrates not to exceed ~20ppm.