Those are feeder roots. They're taking nutrients from the water column. The best part is that you can trim from any part of the plant and shove them into the substrate and they'll keep growing and the old piece will grow a new head.
In the wild the tops get broken naturally from water currents and other reasons like storms and animal movement and the tops fall to the bottom and root and grow anew. I wouldn't trim the roots. Yeah it looks kind of ugly but that's how they grow. Star Grass is the same way from my experience
Imagine the plant like hydra. Chop off its head and 2 more take its place. Later on if you let those 2 heads grow tall enough and chop it off, 4 more will grow. if the plant is able to have little roots showing above water then you can even trim above the roots and replant the plant with no problem as the plant will grow thicker roots when planted. "Even" without roots. For some plants.
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