IMHO... Breeding Goldfish is actually very easy.. Used to do it in my school boy days... Hope I still remember it correctly since it's 20 years back...
Sometimes, you will see a mature female goldfish scatter it's eggs a few days after a major water change, especially with cooler water. These eggs can be left to be eaten since it is usually not fertilized, and also it is not likely to be removable anyway.
Once you identified the mature female, select 2 mature males that you wanted it to breed with. Feed them well with good/live food for a few days. 2 males will increase the chances of fertilizing the eggs or more eggs.
In the mean time, prepare a breeding tank with sponge filter and a good floating plants with thick roots. Water hyacinth will be a good choice.
Introduce the 3 goldfish into the breeding tank. The 2 males should start chasing the female within a few days. Once the female is ready to lay the eggs, it will do it on the roots of the Water Hyacinth and the males will proceed to fertilize it. Remove the 3 fish after the process is completed.
The eggs are then left to hatch in the breeding. Some medication for anti-fungus may be applied. Hopefully you will see the fries after some time...
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