Instructions
Use coarse substrate in your aquarium to give any eggs that are produced some cover from other fish that may eat them.
Keep your breeding pair well fed. You can separate them and re-unite them in the spring, or lower the temperature in the aquarium and gradually raise it to simulate the changing season to prompt spawning.
Watch your breeding pair. When you see them lay eggs, remove the parents from the tank. Otherwise, they may eat the eggs.
Keep the aquarium settings constant and wait for the eggs to hatch. Once they hatch, feed the fry brine shrimp for the first couple of weeks, changing to pellets as they get larger.
Monitor water conditions, keeping the water clean and disease free so you do not lose your fry to dirty water after you successfully hatched them.
How to Breed Fantail Fish
Fantail goldfish are easier to keep than some other types of fish. They thrive in cooler temperatures, even going dormant in near-freezing temperatures. Fantails are differentiated from other goldfish varieties by their tails. Fantails have split tails that are longer than regular goldfish tails. Once you have a breeding pair of fantails, you can attempt to get them to spawn. Goldfish are not good parents, so once you have eggs you will have to protect them yourself, even from their parents.