My $0.02...
For my 300g REEF...I use a 200g sump/refg, tons of micro algae, 50lbs of M mud, 450lbs of LR (total), 200lbs of LS, G-4X skimmer, no bio balls....However I will run carbon in a bag maybe 1x's every 2 months for 48 hours just in case
For my 180g FOWLA...I use a 100g sump/refg, tons of mirco algae, wet/dry, G-6 skimmer, 100lbs of LR and 150lbs of LS
For my 90g FISH ONLY...I use a 30g sump, wet dry, G-6 skimmer
I guess what I am trying to say is...different application can be used, depending on what you are trying to keep