If you have 16 fish, 4 of which are 4", your corals are getting plenty to eat. I have 3 small fish now, 1 Ocellaris Clown and 2 Bangaii Cardinals.
Also, my 2 VHO actinics are right on the surface (literally 1/2" above the center brace) and the halides are 5" off the surface in PFO reflectors. Raising them is not an option with my canopy.