Agree with the other your tanks doing great. The background plant looks like hygro compact to me. My thought was always that long leaves were a sign of not enough light and the plants reaching for more. You probably have a good light to fertilizer ratio. I wish could offer more advice then that but I’m still trying to figure it out myself. My planted tanks have always done great and then not so great. It comes and goes in phases. I don’t have any experience with a high tech tank.