Ok, so i bought some bunched plants today, some Red Ludwigia and some Anacharis. I had a bit of difficulty planting them since they don't really have any roots to anchor them in to the substrate. What is the best way to go about planting these kinds of plants? I was trying to plant them grouped together, like the anacharis all together and the red ludwigia all together, but it seemed tough. How does everyone here do it?