#1 is linecheecked wrasse (Oxycheilinus digrammus)
#2 is a blenny, most likely a Cirripectes species but can't tell more from this shot angle
#3 juvenile spiny chromis (Acanthochromis polyacanthus)
#4 is definitely a dragonet. Either S. morrisoni as suggested or S. bartelsi (Bartel's dragonet). A shot from the side might be more conclusive.
#5/6 not fish