How To Care For A Comet Goldfish. Keep them in cooler temperatures for at least a month before you plan to breed them then gradually increase the temperatures until they reach around 70 degrees Fahrenheit. Since comet goldfish require coldwater they should never be kept with tropical fish as the tank will either be too warm for the goldfish or too cold for the tropical fish.
To properly take care of a goldfish choose a tank that is at least 30-40 US gallons so your fish will have enough space to grow. It is best if you check the acidity hardness and water temperature of the water before releasing them. One of the most important factors in looking after your comet goldfish is getting its home right.
Make sure you dont place them in an overcrowded tank environment goldfish can grow quite large when given the right tank environment which also affords them a longer lifespan.
Comet goldfish is really comfortable with its conservative counterparts and has been very flexible in its living habitat. To prevent injuries to their long tails its best to use a soft sand aquatic soil or fine gravel substrate instead of a coarse product on the bottom of your tank. You can feed tank-kept Comets a daily staple diet of flake food and goldfish pellets. It is best if you check the acidity hardness and water temperature of the water before releasing them.