Why is my goldfish not moving and staying at the bottom of the tank?

Question

Hi, one of my goldfish not moving and stays at the bottom of the tank, compares to other goldfish which able to eat and normal behavior.. But I've changed to clean water and cleanse the filter and with good nutrition food for them.. What could I help the one goldfish that long time stays at bottom of aquarium? Thanks. Pet's info: Fish | Gold Fish | Male

Angel Alvarado, LVT · Accepted Answer

Since the others in the tank are behaving normally, this one may be sick or injured. Ideally, it should be separated into a quarantine or hospital tank Check water chemistry first, even if you've done it already. You can 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 (0ppm) of ammonia and nitrites, with nitrates at 20ppm or less. Perform partial water changes to correct or stabilize water chemistry. Use only conditioned water that is temperature matched to prevent additional stress or shock. Goldfish are cold water fish and do best between 68F and 74F. Change no more than 30% of the volume at one time. In the absence of other symptoms or injury, medications cannot be recommended. You can use plain aquarium salt (NOT table or Kosher salt) as a general tonic to decrease stress, increase gill function and aid in recovery. Dissolve 1 tablespoon of salt per 2 gallons of water in a cup of tank water and gently pour it into the tank. Treat for 10-14 days then perform partial water changes to decrease salinity.

Why is my goldfish not moving and staying at the bottom of the tank?

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