clown loach won't eat

[pcr4blunttopo]

Hi,

One of my clown loaches stop eating today. This morning when I feed them, I found one clown just swim aimlessly whithout eating anything. It's about 4 inches, and nothing wrong with it before. I tested the water and all parameters were fine.

I am worried about this clown right now. Should I take some action now or wait for another day? Is there any idea about what's wrong with my loach?

thanks!

[Tinman]

Do a water change. Bad appetite is usually bad conditions. Clean your gravel. Post a pic so detailed advice can be given by all.....