I've got two "pots" of Ludwigia Repens, one is starting to break the waters
surface with big red leaves and the other is still about the original size.
How do I go about replanting the super grower? I've read that I should chop
it off about half way up and let it float for a week or so to develop roots
before repotting. Although the super grower seems to have an abundance of
extra roots, perhaps that's why it's super and the other is not so super.

Even the Cabomba is staying rooted and breaking the surface. YAY!
Considering I've been threatening to flush it for months, if it didn't stay
in it's damn pot.