At this point the parents will start to eat as many eggs as they can find. For this reason, it is best to remove the parents after spawning is complete. The fertilized eggs will hatch in 4 to 7 days, depending on the temperature. You can feed the newly hatched goldfish specialty fry foods until they become big enough to eat flake or brine shrimp, or you can offer the same food as you feed the parents as long as it is crushed very small. At first, the fry are a dark brown or black color in order to better hide and not be eaten by larger fish. They gain their adult color after several months and can be put in with larger fish once they reach about 1 inch long. See for more information on breeding Goldfish.
Goldfish - Gorgeous long finned black comet
goldfish (common and comets) get 18 inches long and unless you actually buy a black out comet you will never know if they will change however a good clue is how dark they are the darker they are the more they will likely stay black
My Black Common Goldfish | My Aquarium Club
Many goldfish types are very hardy, especially the Common Goldfish and the Comet Goldfish. These two are great for beginners. The Fantail Goldfish and Shubunkin Goldfish are also good beginner fish. Other hardier types include the Black Moor Goldfish and the Ryukin Goldfish. Once you've gained experience and confidence in keeping these hardier goldfish, try some of the more delicate, fancy goldfish like the Bubble-eye Goldfish, Celestial Goldfish, Oranda Goldfish, or Lionhead.
Common Goldfish Developed Black Smudge | My Aquarium Club
Most varieties of fancy goldfish were derived from this simple breed. It's a rather hardy goldfish that can thrive and live happily in an aquarium or pond. The average goldfish lifespan is 10-15 years and they come in a variety of colors including red, orange/gold, white, black, chocolate, blue, yellow or lemon.The Blackmoor cannot be housed with just any other fish. Not because they are aggressive towards others but because they swim a lot slower than other fish. Blackmoors are actually some of the most friendly fish in the world. I would advise keeping them with other Blackmoor species. The swim speeds work out great. Other slower goldfish in the fancy species will work as well. If you house fish that swim at different speeds that eat the same food, just separately try to make sure each of them consumes a valuable amount of food come feeding time.Many new aquarists tend to mix Common goldfish with twin-tails and the result is bullying, stress and sickness for the twin-tails like Black Moor, Oranda, Fantail or Bubble Eye goldfish.Feeding Peas to my Goldfish (Black Comet)
My black comet goldfish love to eat peas. I am feeding them some partly cooked peas in this video.