blue-striped grunt in background
Bari Reef dive site, evening/night.
Not 100% on ID but the only other similar one is the Redtail Parrotfish (Sparisoma chrysopterum).
The rainbow parrotfish (Scarus guacamaia) is a species of fish in the Scaridae family. Among the largest members of this family (the largest in the Atlantic), it reaches 1.2 m (3.9 ft) in length. It is found at coral reefs, mangroves and sea grass beds in the Caribbean and near Bermuda. It was formerly classified as vulnerable due to overfishing and habitat loss, but because the presently available data do not allow an estimate of the population decline,...