They are all in 2 inches in size. I am having them for the past 3 weeks. Color started to change after a week i bought them.
tank size is 4x2x2. Only 6 ryukins are there in the tank allr in 2 inches of size. Kept in a bare tank with normal air stone in it. Not used any anti clorine, the same water using for all other tanks all hav the constant dark red color for som color has intensified.

VB