I bought my plant about two months ago from ikea. It's a good lighting with no direct sunlight . We watered once a week to begin with as I didn't want it to die due to overwatering . However , more and more leaves are brown and the stalk dead . It's got dark brown/ black spots in main stalks and I am worried the whole plant is dying as the leaves feel dry and lushness. I want to know if I have under watered or overwatered it . Please help .