Sure. Sorry if anything was ambiguous. I just meant, RO/DI is a great tool in an arsenal of tools we employ for "successful reefkeeping" but in and of itself all it addresses is your makeup and topup water. If a person is, say for example, overfeeding, then there still is the possibility of an algae bloom. BTW, I thought you gave good examples of other things. Basically, the amount of import should roughly match the amount of export, otherwise there is a "creeping effect" (either towards too much, or too little). Export can be by macros or other (I beleive even mushrooms might have a tendency to pull out nitrates and phosphates but don't quote me on that -- it's only a theory on my part), of course water changes, skimming, and so on.
Clear as mud, no?
