Will having these plants affect the growth of plants planted in the tank substrate? If so would you recommend trying to keep the plants only over a specific part of the tank?
It will reduce the light for plants down below in substrate-especially if roots and never trimmed/plants are not thinned out once in a while (what I'm doing-pulling out 1/2-2/3 of the salvinia). If you barely have enough light for your plants as if you may consider using a floating tied off airline tube to create a no-grow zone like in links below (not my photos)-also makes it easier to feed fish through these areas.
hope this info helps