My new goldfish isn't eating and is lethargic. What's wrong?

Question

I have 2 fancy goldfish in a 60 gallon tank and one of them, has stopped eating and became lethargic after about five days after I got him! He hasn’t eaten in about 4 days. The tank was cycled using a filter cartridge from an established tank. 15% water changes every 4 days and yesterday I did a 50% water change, I then removed the activated carbon and added metroplex and kanaplex and aquarium salt. No improvement. Should I put the activated carbon back in or continue treating with the meds? Pet's info: Fish | Unknown - Fish | Male | unneutered | 0 lbs

Angel Alvarado, LVT · Accepted Answer

Check the water chemistry. A large water change can cause ammonia spikes or other imbalances. Check the water temperature as well. Goldfish do best in cooler water, between 65 F and 72 F. Consider a quarantine tank for him if he is the only symptomatic fish. Continue with the medications as directed on the package.

My new goldfish isn't eating and is lethargic. What's wrong?

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