As for a carpet plant, you shouldn't even really think about carpet plants before you get a planted aquarium substrate. I believe petsmart carries flourite (made by a company called "seachem") which is basically a fertilized substrate for plants roots, (over 80% of the nutrients plants get come from the roots) so flourite is really good, however, you do have to rinse it a lot as it is pretty dusty stuff. But if you can get your hands on Eco complete by I believe "Caribsea" that would be the best in my book, dont have to wash it and it looks nice.
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