Given the size of the adventitious plants (the baby plants) on the inflorescence ("runner"), thee will not be more adventitious plants whether you remove the present ones or not. Adventitious plants tend to sprout about the same time, within a very few weeks. The inflorescence is also not providing any nutrients to the adventitious plants, they are assimilating these from the water through both their leaves and roots and they do this right from the start.
You can remove the adventitious plants by taking hold of the crown at the base and gently pulling it down the inflorescence, toward the substrate. They separate quite easily. Another method though is to cut the inflorescence a couple inches below the adventitious plant. This allows you to plant the adventitious plant while it is still attached to the inflorescence; the advantage to this is that there is more to bury and anchor the small plant. I usually put a couple of rounded pebbles around the base, as it takes a little time for the roots to grow sufficient to anchor the plant, and some fish like cories and loaches might easily keep uprooting them.
Sometimes I have left the inflorescences with some adventitious plants, but the plants tend to have algae problems, probably due to the closeness to the surface light.
