I think this discussion can be aimed at lagoon type environments for our hobby but not SPS or lower nutrient systems. this is great in theory, but text books don't equal real life and don't mean every hobby reef type either or the type of macros we may keep. I use Chaeto about the size of a football so I am a proponent of macros, but I believe lagoons in nature, to be as effective as they are, require ratios to reef sizes that are difficult for us in the hobby to provide in our small setups, and yes small even means my 180g tank compared to the ocean. My perfect setup would have fuges and cryptic zones 3 to 5 times the size of my reef and then I think we are talking legit ratios for a lower nutrient system.