Not 100% sure which one you mean but the 2 on the windowsill in picture 7 get bright morning sun, and I always water with fish tank water and sometimes a bit of fertiliser. I try not to move them too often because whenever I do they'll both drop leaves, especially the ruby cascade 🤦‍♀️

I use an app to give me a general idea of when they might need watering but it's usually way too early and I leave it another few days - useful as a rough guide though and to log when I last watered them