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I would shoot for a minimum of two watts per gallon for the lighting to start with. You can proably get by with plain gravel if you add some fertilizer tabs to it. I know seachem makes some that are supposed to be good. You will especially need something like that for amazon swords as they are heavy root feeders. As for whether or not to add co2, it really depends on your lighting. Everything has to be in balance. Lighting, fertilizing, and co2. In a low light tank, say 1.5 to 2 watts per gallon, co2 is usually not needed because the plants arent growing fast enough to be co2 limited. I would recommend starting slow with 2 watts per gallon, no co2. What other plants are you planning on putting in there? It is always best to plant heavily from the beginning to try to keep algae to a minimum. You might be able to get by with just some root tabs and use the food you feed your fish as fertilizer.
 
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