You should be fine without CO2 mate that's quite low lighting, still add some all in one ferts twice a week tho.
With regards to plants, you can have a few Sword species, nice looking and ver space filling and I know Stargrass (Heteranthera Zosterifolia) comes from the Amazon too. There's also a couple of red varieties of Sword that come from there too so a few to get ya started there.
Could add some redmoor root wood as the Amazon would have lots of roots under the waterline plus some leaf litter.
Hope this helps.