Why are my goldfish dying after adding new fish to the tank?

Question

Hello, I have aquarium, it had 4 goldfishes in it. 2 were about 3 years old and 2 I bought it few days ago. But suddenly, all of them got infected and today one of the old goldfish died.. kindly help me... Pet's info: Fish | Unknown - Fish

Angel Alvarado, LVT · Accepted Answer

It is possible infection or parasites were introduced into the tank with the new fish. It is always recommended to quarantine any new fish prior to adding them to a main tank. Another possibility may be poor water quality due to overcrowding. Goldfish produce a larger than average bio load which means they need bigger tanks and better filtration to handle the wastes. Ideally, one goldfish should have 20 gallons and you should add 10 additional gallons per fish. As they grow, a larger tank will be a necessity. The filter should be rated for at least twice the volume of the tank. Test the water quality or submit a sample for testing. Most pet or fish stores will do this for free or for a nominal fee. Ammonia and nitrites should be 0.25 ppm (parts per million) or less, nitrates should be 40ppm or less. Temperature should be between 65 F and 72 F. Partial water changes (30% of volume) can be done daily to stabilize water chemistry. Use only aged or conditioned water that is temperature matched to prevent further stress or shock. Plain aquarium salt (NOT table salt) can be used to treat minor infection (bacterial or fungal) and to aid in healing. Dissolve up to 1 tablespoon of aquarium salt per gallon of water into a cup of tank water and slowly pour it into the tank. Treat for 7-10 days then perform water changes to decrease salinity.

Why are my goldfish dying after adding new fish to the tank?

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