It's not a problem to grow plants in pool filter sand. You just need to fertilize them. I have a 14g planted tank that I have no problem growing plants in. I use Flourish tabs, DIY CO2, and liquid ferts twice a week.
My plants stay in the sand easy enough one they are established. If you have a problem with them staying where you want them use a rock to hold it down.
Here's a pic (I really should post a more recent one, though, but this will give you an idea):
