You can feed them aquatic plant food if you want, sure, and they'll love it. You don't have to plant them, though. The roots are not really like normal roots, but are instead mainly used for anchoring. This is normally a floating plant. The flowers, ( yes, it has flowers, ) poke up through the surface to bloom in the open air, but the plants like to be secured in place before blooming.
This is a fast growing plant that likes a lot of light and food. Given both, it can easily take over your tank in short order.
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