Kupang Cardinalfish (Ostorhinchus wassinki) キンセンイシモチ
The lower stripe with a little blue in it should extend to the base of the anal fin. Miyakojima
Male Kupang Cardinalfish are mouth brooders, so if it looks like its mouth is full, it is brooding eggs. Amami
Juvenile Kupang Cardinalfish. Amami