Want low light red plant and also carpeter
I'm looking for a low light red plant, most likely stem, for a background plant in my 55G. I already have Ludwigia sp. 'red' and Alternanthera reineckii, but the latter isn't growing very well, presumably due to the light level (and somebody is also eating it, I think). I'd love some Ludwigia glandulosa, which I think is low light, but nobody seems to be selling it. Other than that, any other suggestions?
Also, I'm looking for a carpeting/foreground plant that stays relatively low and looks good even in substrate that is a little bit coarse (for example, Marsilea minuta doesn't look great because its leaves are smaller than the pieces of gravel underneath it). I don't want Pygmy Chain Sword or dwarf sag. Any other ideas? Could lots of crypt parva work? or maybe Anubias nana 'petite'? Anything else?