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What look do you like best? There are lighter colored substrates like PFS, darker colored substrates like eco complete and floramax, red like flourite, soil like ada aquasoil or even potting mixes and mineralized top soils. It's really about what you want.
You can do that, or floramax, eco complete, or any other black planted substrate. I really like floramax, but it's all personal preference... I have a mix of flourite and floramax in my 40 and like it very much.