Nutrient Content: Carpeting plants are often heavy feeders, requiring ample nutrients for vigorous growth. The substrate should either contain these nutrients naturally or be capable of holding and releasing them effectively. Root Anchorage: A well-rooted carpet is a stable carpet.
Requires nutrient-rich substrate or fertilizers in sand or gravel substrate. This is a slow grower plant. CO2 is greatly appreciated if you want to improve the growth rate.

Eco Complete is just an very expensive snail oil. It's just too light and coarse for successful carpeting. I had it in my tank until last week where I happily ditched the lot. Went toxic and locked up.
As we can see from the illustration, Complete Nutrient Supply Carpeting Substrate has many fascinating aspects to explore.
EI supplies nutrients, but not carbon stability by itself.Unstable CO can cause algae even with perfect fertilizer dosing.