Regular gravel by itself has worked for some, but I would suggest somthing additional, maybe mixing in some eco,flourite or putting laterite under the gravel... I use a sand/flourite mix and add root tabs around my plants that are heavy root feeders.
120g, Flourite & Sand. DIY Stand and Canopy. CF lighting 3wpg, Pressurized C02, DIY reactor. 2-XP3's, 500watt heater.
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