I would just use plain gravel and not expensive Schultz. It is inert and wont cloud your water, but since plain gravel is so much cheaper, and you only want it for a filler and not to provide any nutrients, why not just use gravel?
I think the cheapest alternative to flourite in the bottom layer would be regular gravel. I would probably put the flourite/gravel mixture underneath a layer of plain gravel, instead of the flourite on top. I think the plants roots would have better access to it that way.
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