These are examples from youtube to show the various types.
"Azuma Nishiki" was Created by KATOU Kinzou in 1931 Yokohama. This type is called "Hon Azuma" (True Azuma. Original Azuma.) now. It had been popular Fish as Ranchu. Even a famous old Ranchu club has the name from it. but It lost popularity for some reasons. and then because the Head is not enough fat. Suzuki Fish Farm crossed it with "Hama Nishiki". that line is called "Suzuki Azuma". Suzuki Azuma is now the most popular and looks good. Those 2 lines has different Head Face & Cheak also the Color. "Hon Azuma" has more Pale Sky Blue on Body. Round head like Oranda. and It should have Red head, Front Spread side Tail bones and Snake Eye Dots on Tail.
Suzuki Azuma-Nishiki (Azuma-Nishiki x Hama-Nishiki 1979) The Head (Funtan = Cheak Bump, Tokin = Helmet), Body and Texture of Colors are different from Hon-Azuma.
Original Azuma-Nishiki. (Original Oranda x Calico Dragon Eye.1931)
Sodium thiosulfate is a very safe and effective chlorine treatment (Does not treat chloramines but will threat the chlorine and your biofilter will eat the liberated ammonia, or buy cloramX from www.reedmariculture.com). Below are two stock solutions made up for 1 liter and 1 Quart. To make the stock solutions that treat 50 gallons per mL or 250 gallons per teaspoon simply follow the recipe below. Or you can utilize the fact that Sodium thiosulfate has a solubility of 701 grams per Liter of water. Simply take your container, add hot water as sodium thiosulfate (it's endothermic in water, it gets cold when it dissolves) and add it until it will no longer dissolve. You now have a saturated solution that will treat 1 ppm chlorine in 50 gallons at 1 ml.