your best bet might be to use a coarse sand for a substrate mixed with gravel of 2mm size. you want to get a fair amount of stem plants that are quick grower like hygro and such as they will take up nutrents fast from the water. also if you find jobe sticks for lush green ferns and put them in the sand around the plant roots they will go better. as for Co2 with that low of lighting it is doutfull you will need it. try just the fertalizer first. I have a recipie for a good home made fertalizer somewhere I will see if I can find it for you. as for a comunity tank take your time and research the fish first.. you will find some tetra's are not realy comuntiy fish even though every fish store will tell you they are. but best bang for buck go lots of plants and about 4 or 5 different types of tetra's.. i would recomend, emperior, blue neon, black neon, lemmon and rummy nose. also you can throw in a pleco but stick to the naturaly small species like candy stripe or better yet a bristle nose. you would be trying to find a proper size home for them in 5 or 6 months
Steve
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