My goldfish has brown spots and it's getting worse. What to do?

Question

Hello, we have a fan tail goldfish and it’s getting brown spots/splotches all over him. I’ve changed the water in the tank already and added the ammonia detoxifier. It seems like it’s getting worse.

Angel Alvarado, LVT · Accepted Answer

This could be ammonia burn. Check the water chemistry. Use a home test kit or submit a water sample for testing. The local Petco may do this for free or for a small fee. Aim for an absence (0 ppm) of ammonia and nitrites with a nitrate level of 20 ppm or less. Partial water changes will be needed to stabilize chemistry. Use only aged or conditioned water that is temperature matched to prevent further stress or shock. Goldfish are cold water fish and do best between 65 F and 72 F. When using an ammonia reducing product, be sure to test the water after treatment but before pouring the treated water into the tank.

My goldfish has brown spots and it's getting worse. What to do?

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