A good method is Orca bio-cubes, check out
@Hails and
@butcherman L-shaped frag tank, just skimmer, bio-cubes and some other offerings from Orca, such as reef x-trax cubes, good lighting and good water movement.
They also never do water changes. but each to their own.
They get fantastic coloration on corals in the frag tank, i don't recall seeing liverock in the sump.
They do keep one or two fish, but i've also seen fishless sps systems with thriving corals, so i think the "corals need fish waste" is a bit of a myth, my opinion.