Help! I'm new to succulents and trying my best here. I haven't yet identified this little guy, but he's definitely not doing well in my care. He has full sunlight in a bright, south facing window. The window gets bright light for most of the day. I've been watering until some seeps out the bottom, and then allowing to dry completely (about 7 days) before watering again. However, the leaves keep shriveling up and falling off, and I've noticed brown spots on the leaves and brown edges. Thank you!!!!