[Steven_Chong]

Is there really a need? I mean, air has way more CO2 than water right?

-the main limit on vivarium plants is making sure you have ones that you can keep at the right size. No point in having an orchid or pitcher plant that'll just out-grow the tank. Mosses are good base plants, aquatically, semi aquatically and terrestrially. Another one I'd think of is bacopa-- grows stems under-out of water, and terrestrially forms nice, dense mats. Easy to keep small with trimming too.