What could be wrong with a fish that scrapes itself on everything lies the bottom of tank pants like dog has loss appetite is supposed to yellow but yucky slimy grey color?

1. Ammonia or Nitrite Poisoning:

- Check water quality and test for ammonia and nitrite levels.

- If levels are high, perform immediate water changes of 50% or more.

- Continue water changes until levels return to safe ranges (ammonia and nitrite should be 0 ppm).

2. Bacterial Infection:

- Scraped areas, panting, and loss of appetite can indicate a bacterial infection.

- Observe for other symptoms like popeye, clamped fins, or red streaks.

- Treat with broad-spectrum antibiotics under veterinary guidance.

3. Parasitic Infection:

- Parasites, like anchor worms or flukes, can cause irritation and discomfort, leading to scraping and bottom-sitting behavior.

- Examine for tiny white dots, worms, or lumps on the fish's body.

- Treat with appropriate antiparasitic medications.

4. Environmental Stress:

- Sudden changes in water temperature or parameters, overcrowding, or poor water quality can stress fish.

- Ensure the tank is set up properly, with stable conditions, clean water, and adequate filtration.

5. Internal Problems:

- Digestive issues or internal blockages can cause loss of appetite and unusual behavior.

- Consider whether there are any dietary changes before the symptoms appeared.

- Consult a veterinarian for further diagnosis.

Additional recommendations:

- Isolate the affected fish in a quarantine or hospital tank to prevent spreading issues to other tank mates.

- Provide clean and treated water in the quarantine tank.

- Monitor the fish's behavior and appearance closely for any improvements or changes.

- Seek veterinary assistance if the fish's condition doesn't improve within a few days.