Coral Rabbitfish
Siganus corallinus
Similar to the chin-strap rabbitfish... only without the black mark/chin-strap under the chin.
Chip-strap Rabbitfish
Siganus puelloides
Has a black mark/"chin-strap" under its chin.
Rabbitfish
Schooling Rabbitfish
Siganus argenteuas
Starry Rabbitfish
Siganus laques