DSB. Live rock. Skimming.
That is for all three of my tanks.
One has heavy caulerpa growth/nutrient export. Another has heavy xenia growth/nutrient export.
W/D, bioballs, no sand, skimmers (2), ozone, mechanical, chemical, denitrator, O2 reactor, .....oops, sorry that was years ago, now just LR/LS/Skimmer.