05-18-2012, 08:31 AM
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Java Fern and Anubias work very well under low light, in fact they must be shaded if lighting is too bright because algae will grow on their leaves otherwise.
Pygmy Chain Sword should work, it's a small version of Amazon Swords and can 'carpet' a tank since they are very prolific, but in low light they'll grow taller so you may or may not want that.
I've had Echinodorus amazonicus in a 20g tall with a single 18" T8 do very well. I got mine at Petsmart in the tubes, you get 2-4 in a tube and I think it was $5 or so. Those are the emersed form though, so the leaves will die off as new ones grow from the center of the crown so don't get discouraged thinking it's dying. It isn't, just switching to submerged leaves.
I was also able to grow Wisteria, but it was very slow starting. Stem plants usually need at least moderate light, but some can do okay under low.
Basic crypts (Cryptocoryne wendtii) can work well under low light too. These can be finicky though, they can 'melt' after planting/moving them (and any number of other reasons) but they usually will spring back.
If you have medium-hard to hard water Vals work well. They will not last long in soft water though.