What's alert!!

Last Sunday, My fish alert something. It jump "zoom" on the morning. I saw the water. It 's strange. It seems as yellow water. Ummm, I guess the water may be factor. I don't change water in tank around 1 week. The filter is longer than one. I prepare to bring water out (about 30 %). I bring some bucket to contain that water. I use that water to clean filter. Because it has necessary bacteria there. Then I fill water back(30%). After that I let filter clean the water by itself.
In afternoon, I'm back at tank. The water look better and clear. My fish is fine. But my fish's chaffs gone about 2-3. Ummm. It's my false. My fish still don't eat the feed.

I think my fish may still be alert. I don't feed it about 2-3 days.

Today , it's better. It can eat more and look fine.

The water quality is important. My fish may be in high NO2 water for a few week. Because some feed in filter increase the among of bacteria. When it eat that feed, it will send some NO2 to water.