I kept jungle val in the past in a 10 gallon which never melted right away and grew like grass, had to trim it every week. Now I have it in my 20 Long and 55 gallon tanks and they are not growing long at all, it is almost hard for me to tell difference between sag and jungle val. I want it to grow to the surface but it stops growing. They shoot off runners like crazy but growth is stopped. I am using Finnex planted plus lights on both tanks, maybe too much light??? doesn't seem like it. My 55 is dirted/low-tech. 20 has flourite. any ideas??? Thanks!!!