Coral Cardinalfish (Ostorhinchus properuptus) キンセンイシモチ – size 6cm – Southern Orange-lined Cardinalfish
The lower stripe with a little blue in it should extend to the base of the anal fin. Miyakojima 2017
Male Coral Cardinalfish are mouth brooders, so if it looks like its mouth is full, it is brooding eggs. Amami 2024
Juvenile Coral Cardinalfish. Amami 2024