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Depends on what plants & light you have as to "best" substrate. For a low light tank, you don't need any of the fancy "nutrient" substrate like ecocomplete. Coarse sand (like pool filter sand) is good. Inert plant substrate like Schultz Aquasoil are other possibilities.
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80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.
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