Oh Maranta (prayer plant)... just saw the name on your Riparium plants list! Woo-hoo! thread.I see you are using expanded clay like Aqua Aurora. And, how is the Maranthera doing? I love that plant!
The one I had in the planter had no roots, it was a cut-off from my 15 gal tank. so it died. I don't know how to multiply those. But anyway, the one in my 15 gal which is in a shower caddy does fine. It had flowers at one point.