It is best to use crude salt or special salt for aquarium, but not seasoning salt with additives, such as iodized salt. Salt should be dissolved in advance and filtered before adding, and the salt concentration should be gradually increased within 1-2 days to avoid the osmotic pressure shock of fish.

Safe concentration of salt: the concentration of salt should reach 0.3%-0.5% to adjust osmotic pressure, which is very safe for most fish. Some fish, such as some soft-water fish and some catfish, are very sensitive to sodium chloride, so be careful with salt.

principal item

(1) Blood parrot: Its body color is red, its body width is broad and its tail handle is short. The face is like a parrot: big eyes, small mouth, and the maximum length is 20 cm;

(2) Macaw: a variant of the blood parrot, with a sarcoma bulge on its head, big red, a body length of more than 30 cm, and a life span of about 8 years;

(3) Purple parrot: select strong individuals of blood parrot and feed them with special feed for artificial color enhancement;

(4) A heart parrot: A blood parrot that cuts off the tail of the larval fish by surgery, and looks at the shape of the elephant heart when standing upside down;

(5) One-horned Fairy Parrot: A blood parrot that uses surgery to trim the front end of the dorsal fin of the larvae into the shape of a rhinoceros horn.

(6) Candy parrot: Make the blood parrot purple, blue, yellow and orange by injection. But the color is not durable. In addition, there are laser-dyed blood parrot fish with the words auspicious, blessed, wealthy and longevity.

Parrotfish (scientific name: Amphilophus) or parrotfish, parrot fish, scientific name: Luoshen neck fin fish, a genus of the family Lepidopteridae, commonly known as parrot fish, parrotfish, red wedge snapper, etc., are tropical fish living in coral reefs. It is named after its bright colors and mouth shape resembling that of a parrot. Another kind of freshwater ornamental fish, also known as blood parrot, is bred by crossing the male red devil fish of American cichlid with the purple crater. When the tide is high, parrot fish, large and small, wearing green and Huang Cancan coats, swim from the deep water of the slope outside the coral reef to the shallow reef flats and lagoons.

Parrotfish have a special digestive system. Nautilus fish use their plate-like beaks to chew off corals along with their bones, then grind them with their throat teeth and swallow them into their stomachs. Nutritive substances are digested and absorbed, and coral debris is eliminated from the body. The throat teeth of parrot fish are not as sharp as teeth, but have evolved into a stone shape, and the maxillary surface of the throat teeth is convex, which coincides with the concave below.