I'd like to add more plants to my 50g (110watts). Unfortunately I didn't plan on this tank being planted (didn't realize how easy it was to buy a shoplight from home depot and set it up in a DIY hood, thought I would only have the 30watts [!!!!] of lighting that came with the tank). For that reason, I put in gravel instead of sand. How do I put plants in there without changing all my gravel to something more suitable for plant growth? Can I create "pots" for each plant out of tupperwear with sand or the such in there? Any other ideas?