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Not being a tropical species by nature, water temperatures above 70 °F to 75 °F (21.11 °C to 23.89 °C) are not recommended for, and can cause respiratory issues, fatigue, and even death, in pond loaches. For this reason they make a viable companion species for goldfish, which also are a cold-water species.
Extremely high temperatures (over 30 °C (86 °F)) can also harm goldfish. However, higher temperatures may help fight protozoan infestations by accelerating the parasite's life cycle—thus eliminating it more quickly. The optimum temperature for goldfish is between 20 and 22 °C (68 and 72 °F). [45]
[2] [3] Sometimes the wen grows enormously, covering the eyes of the goldfish. Due to this, the fish may have only limited eyesight or even become blind. Special care should be given to the wen because it is prone to bacterial infections. The Oranda can tolerate temperatures from 17 to 28 °C (63 to 82 °F).
Common goldfish in a pond Common goldfish in aquarium. It is a common practice to keep common goldfish in a small bowl, but this allows waste in the water to build up to toxic levels and does not provide enough oxygen. For each small/young goldfish, there should be a minimum of 10 US liquid gallons (38 liters; 8.3 imperial gallons) of water. [3]
It supports double anal and tail fins. The anal and caudal fins are well divided into two matching halves. Although generally considered a hardy goldfish, Fantails can be sensitive to prolonged exposure to low water temperatures. Keeping Fantails in an aquarium requires an ideal temperature of 73 to 74 °F (23 °C) [2]
Japanese koi carp are coldwater fish. The term coldwater fish can have different meanings in different contexts.. In the context of fishkeeping, it refers to ornamental fish species that tolerate the temperatures of a typical indoor aquarium well and do not require a heater to remain active, as opposed to tropical fish whom need a heater to survive in the room temperatures of temperate climates;
Goldfish has just announced that it's embracing its more mature, sophisticated side with a fitting new name. As of today, Goldfish will now be known as Chilean Sea Bass crackers.
Goldfish are typically easy to care for, and black moors in particular are able to withstand a wide variety of temperatures. They do well with other fancy goldfish varieties, especially those with impaired vision such as the bubble eye or Celestial goldfish. In 1941, Moscow aquarist P. Andrianov bred a kind of black telescope with orange-red eyes.