hmm ok. I only have 2WPG, but it's a 20L tank so at least the tank is short. I also haven't had the wisteria very long. When I bought it from the LFS it was very tall, it was barely getting any light. It was cheap though. Anyway I had to cut it way down and it's starting to look much better. I'll give it some more time and hopefully it will spread out more. Thanks!