Live plants will get their nutients from your gravel as the fish do their thing. Just do regular water changes, siphoning off the excess crud. Another thing to consider is the amount of plants you use and the type of plant as well. Some tetra species will lay their eggs on the underside of broad-leafed plants like Swords. Othes will scatter their eggs in which case something like Hornwort or another such plant would be best for catching the eggs as they drop through the water. Just some food for thought. Good luck!
Tony
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