Thanks y'all!!
The Iridescent sharks prefer the water temperature between 22 to 28 degree celcius.
goldfish or red fish like cold water, but 22-24 is perfect for both world!!!
Don't worry, I have them for a year now, and they're top shape goldie and have grown like crazies!!!!!
This is like cats and dogs!! They're are not supposed to love each other , like my fish, but they do....don't try this at home...ahahah just joking!!! I guess I took a big guess to put them together but it work well for me!! So a bit off topic, but look at them....