Fish scales turn yellow.?

Question

Since 3 weeks ago, I realised that some my fishes scales turn yellow. I've changed the water twice and they are still the same. What may have cause this to happen ?

Answer 1

It would really depend upon the type of fish that you have in your tank. Some fish do periodically change color. I have angel fish who have changed color multiple times.

If they are acting normally other than the color change, they should be fine. Just monitor them for any other changes.

Answer 2

What kind of fish are they? are they all the same kind that is turning yellow if so it may just be what that kind of fish does some fish changes color like Oscars for example