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The Flourite won't give your plant roots any additional O2, but it should be a decent source for micros like Fe.

Is there a reason why you decided to choose three different substrates? Most times when someone mixes substrates it's to use something inexpensive and inert (like gravel or sand) with something fortified (or with higher CEC like laterite, Flourite, etc...). But you've got three bags of prime stuff.

If you like the look of black substrate you could use some black sand over the Flourite (is it bad luck to use black sand or is that just taking lava rocks?). Also, if you are going to mix the Eco-Complete and Flourite I'd suggest you take the Flourite Red back for either another bag of regular Flourite, or like Raul suggests, another bag of Eco.
 
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