* Loss of Buoyancy: Goldfish normally have a swim bladder that helps them stay upright. If they're resting on the bottom, it could indicate problems with this organ, which can be caused by various illnesses.
* Lethargy: Goldfish that are sick often become lethargic and less active. This is another red flag.
* Eating Habits: While it's good that your goldfish is still eating, it's important to monitor how much they eat. If they're not eating much or are struggling to eat, it's a sign of potential illness.
What to Do:
1. Observe carefully: Monitor your goldfish closely for any other symptoms, such as:
* Redness, swelling, or lesions on the body
* Difficulty breathing
* Cloudy eyes
* Changes in behavior (like hiding more)
2. Water quality: Check the water parameters (temperature, ammonia, nitrite, nitrates) to rule out water quality issues.
3. Isolate if possible: If you have multiple fish, isolate the sick goldfish to prevent spreading any potential disease.
4. Consult a vet: Contact a veterinarian specializing in aquatic animals. They can diagnose the problem and recommend the best treatment.
Remember: Don't delay seeking professional help. Early diagnosis and treatment can significantly improve the chances of your goldfish recovering.