Most crypts are very good for low light, bacopa, java moss and java fern, arachnis are very easy.
In my lowlight tanks, the red dwarf lilies grow very well.
Last summer, I bought two banana plants about four inches high each. One I put in my lowlight tank, the other in the highlight.
The highlight one already outgrow the 30 g cube and is simply humongous.
The lowlight is very green, but pretty much the same size as when I got it.