This is the spotted scat.It can be found in many places. This is a euryhaline(Can survive marine and fresh water)fish. Though it is popular,better watch out for those spines. They are venomous.(family Scatophagidae)

This is the clown triggerfish. It is territorial though popular. It's special feature is to be able to lock it's dorsal fins in upright position to prevent being sucked out of a crevice.(family Balistidae)