Michael,
The way I run my tank is somewhat controversialm but...
I do very few water changes (every three to four months about 10%
I have only a few fish and a LOT of LR in the tank and the sump
(doubles up as a refugium).
Yellow tang and tri-color blenny eat mostly algae, Mandain eats ...posd
and clowns do pretty good on other critters.
I'vebeen watching my tank at night and there is a lot of "food" in the
column, and since refugium is on opposite cycle, a lot of things end up
in the tank during the day too.
I'm watching them very closely and they look well fed and groomed.

Regards
Yuriy