Managed to process another photo from blackwater diving in Palau recently. It's difficult to ID juvenile fish, but I'm reasonably certain this is a juvenile blotched bigeye or glasseye (Heteropriacanthus cruentatus), thanks to ID assistance from Bob Halstead.
It was 3-4cm long (the fish, not Bob).
![juvenile heteropriacanthus cruentatus bigeye juvenile heteropriacanthus cruentatus bigeye](https://www.tonywublog.com/assets/images/2014/05/juvenile-heteropriacanthus-cruentatus-glasseye-palau-tony-wu.jpg)