[cypher]

They all need soil to grow into decent sized plants, I have grown that mix on damp paper so it's a bit like cress & they loved it like that but it would only last a few days.
Unless you put your tank in bright sunlight which you wouldn't want to do nothing will grow into a decent size plant really though.
I don't know for sure but would imagine the larger the surface area of a leaf the more carbon dioxide so grass might be better.
I can see where you're coming from with this, plants in the cage/tank is a lovely idea but really problematic.

Fluffagrams I hope May enjoys her weeds (& James too of course). It's always gone down well with mine.