I wanted to do a small experiment with various substrates using comercially available potting soils. The rules are simple: Identify a mix that you think might work, use it in a small setup for about 3 months and see how well it works. No aditional additives allowed except sand to cap it off. So here is my first try. Substrate: African Violet mix and riversand. Step one - Layer African violet mix on the bottom Step two - Cap off with riversand Then time to plant it with Eleocharis Parvula. Fantastic until I added apple snails. They pulled out all the parvula. Note to self - this substrate mix does not anchor plants very well. That is why the snails keep on pulling the parvula out. So out went the parvula and I replanted. This is what it looks like now. I'll update as often as possible. So everybody can see how it goes.