Uneven patches on clown loaches

[joietan]

Hello all

Would you please help to identify whether my loaches has disease?

There are some uneven coloration
I notice it today.
Yesterday i overfed some new fishfood

Today i vacuum all remaining food and did 60% water change.

Thank you,
Joie
https://share.icloud.com/photos/0OCq4LG ... ari_&_Miji