If you're talking about Jurunese, the growth rate is slow to the point of almost being unnoticable unless you actually measure it. I have had mine for about 8 months and it have only grown an inch or two. Slow growers like the tigs.
My Tig and Jur have both grown appx 4" over the last 5-6 months. Not a rapid growth rate but not so slow either. Water changes are more important than even feedings.