[@marko@]

wow, big eco. mine is practically sand. its a good substrate, though. your plants will do great in it (full of nutrients, and almost as much iron as flourite).

good buy on the rock. all my LFSs have is slate, granite, and argonite.

tetras tend to stay near the bottom, especially when there is no thick background to dart into if higher up. so i suggest you put some white clouds (or gold clouds) in addition to the tetras; to have some reason to look at the top of the tank.

may i suggest you also try some Lilaeopsis mauritius? it looks just like the brazilian micro sword (in my 20L i have both and i cant tell the difference). however, it acclimates much faster and grows faster overall.