Lethargy and sitting at the bottom of the tank in goldfish often indicate stress or illness related to water quality. Check your water parameters (ammonia, nitrite, nitrate, pH, temperature) immediately, as poor water quality is a leading cause of fish ailments. Other potential causes include parasites, bacterial infections, swim bladder issues, or overfeeding. Perform a partial water change if parameters are off. Observe for other signs like clamped fins, gasping at the surface, or visible spots. Speak to Dial A Vet via a video consult should you need further guidance.Clinically Approved Standard by Dial A Vet Veterinary Team
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