Lilaeopsis can take it's time to start producing runners, more or less depending on the situation. In the meantime the original blades can suffer from BBA and fuzz algae. Seems like it's harder with a smaller portion, I had the best success starting with a lot of it, and planting 1" clumps in a checkerboard pattern. I have not tried to grow a carpet of it outside of full on high tech parameters, but I've always had stray runners reaching around my low tech tanks where it was totally ignored. If there really is a problem with it beyond normal acclimating, I would look at possible light issues, either too much or not enough.
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