Here's some great ways to lower nutrients and practises used , funny enough I don't see water changes as a primary route to go in fact rhf (pretty sure his words are good no?) Even says in the opening paragraphs that decades ago it was the primary way to remove nutrients but is not the case anymore , we have much better ways of doing so now as the article explains in great detail lol
http://www.advancedaquarist.com/2003/8/chemistry