u/Adventurous-Luck7210

Edited photo (left). Original photo(right)

My Blue Rim’s body is turning pinkish. When I got him from a local breeder, his body are normal white. Is he okay or should I be worry?

My tank setup is 22x15x17cm (I know it’s very small but I will change it later), natural aquatic plants (Wendti, Java Fern, duckweed, frogbit and catappa leaf) with no filter at all. I gladly accept suggestions.