I have an indoor plant that is a foliage, no flower, with beautiful large red leaves, approx 4 x 8'. The plant is just one stem and is about 4 feet tall now. As the new leaves come out at the top they look healthy, but then the ends brown. The plant overall looks kind of sick and the bottom leaves drop off. I'd like to find out what I'm doing wrong but I don't know what the plant is.