The next time I do a major overhaul of my tank I will try this. But, I'm still wondering, should I do routine EI fertilizing, and just depend on the substrate to augment the fertilizing, or should I wait to start EI fertillizing until the substrate seems to be running out of nutrients? Or neither?

I like the idea of having a heavier substrate to make it easier to plant and keep plants from floating back out. Plus, this might make substrate formed into hills and valleys last longer before they self level.