I have a Black Bat plant that hasn't been doing well for at least a year. When I bought it, it was full of luscious leaves. Then they started to brown and die off. But I kept working on it to try to get it back. Every time since then, only a set of 2 leaves grow. Within a week they start to brown and wither. I've moved it a couple of times trying to find the sweet spot for it to grow. Does anyone know anything about this plant and what I'm doing wrong? I'd appreciate any advice you could give me. The window is just above it and I've already had to remove one leaf.