Fluorite and eco-complete don't really contribute nutrients to plants in any large amount. I consider them both inert.
I wouldn't use pH buffers at all unless your pH is something crazy (above 8 or below 5). Messing with pH buffers all the time is asking for trouble, especially when 99% of the fish and plants hobbyists are likely to encounter aren't extremely picky about pH. The whole pH-has-to-be-perfect fad is really just there to get you to buy more products.
You mentioned "capping gravel" but then didn't say anything about soil. Are you planning on using soil under the gravel cap? If so, then you won't need to dose EI unless you get nutrient deficiencies. With soil in the tank I'd play it by ear and see what deficiency shows up if one shows up at all. If you are planning on just using fluorite/eco/etc... then start EI dosing from the beginning.
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