Good deal on saving the fishies!
That water wisteria....I hate that stuff...haha. It grows very fast. It is a plant you will trim once a month or more. Even if you have plant eaters, it will overgrow the tank fast. Even trimmed, it becomes huge tree trunks with no foliage after a while. Good news is, it roots super easy. You can start with a chunk of a leaf and have a full plant in no time.
I wound up removing all of this from all of my aquariums. It was a plant that just made it impossible for fish to do what fish do. I lost more mollies to getting stuck in the stuff than I care to mention. Almost lost my electric blue jack dempsy cause of it. He got stuck, and the other fish nipped all his fins. I found him at the top gasping and almost dead. You might have different luck with it. I traded 6 gallon freezer bags packed full for some fish at my lfs. Glad it's gone!