Red tiger lotus is going to be a real challenge without Co2. I have one in my 60g planted tank, in which I stopped using Co2 a few months back. Once I did, the leaves got very thin, and began ripping simply from the current in the tank. Last week I began adding Co2 again, and it's now as strong as it was in it's prime, and growing back with a vengeance! I wouldn't recommend it for a low tech tank.
Sword plants are among the most light hungry of the "lower light" plants, and often have a tendency to grow out as opposed to up. I'd recommend putting it somewhere towards the middle section of the tank as opposed to the back. Amazons are a good choice for low tech. I don't have any personal experience with the other two you mentioned. Though I can say that the red melon sword you mentioned before also will struggle without Co2. It will stay alive just fine, but it's growth rate will be very slow, and it won't get very large. And again, it won't show much of the red color you might expect. Aquatic plants with red tones require Co2 & high light to show their "true" colors.
In the back corner and wall hugging sides of the tank is where I'd suggest you keep your taller plants, where they can also be used to disguise heaters, filter inputs, etc.
Sword plants are among the most light hungry of the "lower light" plants, and often have a tendency to grow out as opposed to up. I'd recommend putting it somewhere towards the middle section of the tank as opposed to the back. Amazons are a good choice for low tech. I don't have any personal experience with the other two you mentioned. Though I can say that the red melon sword you mentioned before also will struggle without Co2. It will stay alive just fine, but it's growth rate will be very slow, and it won't get very large. And again, it won't show much of the red color you might expect. Aquatic plants with red tones require Co2 & high light to show their "true" colors.
In the back corner and wall hugging sides of the tank is where I'd suggest you keep your taller plants, where they can also be used to disguise heaters, filter inputs, etc.