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I bought 4 golden fish 4-5 months back. I kept them in a bowl of water, was daily removing a glass of water and was adding fresh glass of water.
Starting 2-3 months everything was fine. But slowly one of the fish started getting black spots on its outer surface of body and then died. Then one by one rest of the fish also died.
This also happened when I tried keeping them in aquarium which also had air pump for oxygen. Any one who can let me know what was the reason that this happened?
Thanks
The result may be ammonia poisoning.
The solution may be to add a filter into your tank, and make sure you don't overpopulate the fish tank either. Don't feed them too much
Further, each goldfish needs 3 gallons of water per inch of their body or more.
There might be several reasons for fish to get ill and die. Over feeding might result in toxic substances developing in the water. This often weakens or kills the fish. The fish might also be infected before you buy them.
You need a water filter to handle the waste from your fish, and the fish tank needs to be cycled before you add fish or other animals to the tank.
"Cycling a tank" means letting bacteria that break down waste grow and multiply so they can keep the water clean. These bacteria convert fish waste to plant food, this is called the nitrogen cycle.
Ammonia could have been it or you could not have been using filtered enough water in the first place. They also would be way to crowded in a bowl. Especially or four.
