Papuan scorpionfish

Scorpaenopsis papuensis

''Scorpaenopsis papuensis'' is a scorpionfish from the Pacific in coral reefs. It occasionally makes its way into the aquarium trade. It grows to 25 cm in length. It is difficult to see due to its camouflaged colors.
Scorpaenopsis_papuensis Tanjung Lampy, Lembeh.
Scorpionfishes are difficult to properly ID just based on coloration as they can change it to mimic the environment. 
I think is S. papuensis based on the long cirri above eyes and the large facial skin appendages that are typical in young specimens of this species. The ID is open to debate. Geotagged,Indonesia,Scorpaenopsis papuensis,Spring

Behavior

The Papuan scorpionfish exhibits biofluorescence, that is, when illuminated by blue or ultraviolet light, it re-emits it as red, and appears differently than under white light illumination. Biofluorescence may assist in intraspecific communication and camouflage.

References:

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Taxonomy
KingdomAnimalia
DivisionChordata
ClassActinopterygii
OrderPerciformes
FamilyScorpaenidae
GenusScorpaenopsis
SpeciesS. papuensis
Photographed in
Indonesia