Mine has gone buck wild in my fluorite/profile mix (about 70% flourite). I use EI fertilization and occasionally put a flourish tab into their area.
Growth started a little slowly, but then after about a month runners were shooting out everywhere. I started with three smallish chain swords. Now several months later they form a thick lawn across the entire front of my 75g.
75g heavily planted hi-tech tank
10g low tech, except lighting
whiskey barrel pond