We have also kept Amazon Swords in lower light conditions where they have also done well. The biggest thing for good Amazon Sword growth is food. Amazon Swords love to “eat” We have seen them do OK with out a decent substrate but they would likely enjoy a dose of Iron to keep them lush.
Ideally, you want to have Amazon Swords in a planted tank that has a large amount of nutrients available in the substrate. Amazon Swords are heavy eaters and will prefer this setup.
Small Amazon Swords are $3 and are anywhere from 2-5 inches. If you are ordering a few small ones we might thrown in ones that are slightly smaller than 2 inches but we will give you an extra plant.