I'm having trouble keeping this poor cactus alive. I have no idea what to do - more water? less water? more light? less light? It's such a pretty cactus, it's horrible to watch it deteriorate. Can anyone identify it? Once I have it's proper name, I can begin researching proper care. Of course, if you are familiar with this plant and think you know what might help it improve - I'd be very happy to hear from you on that as well! Thanks everyone for looking. :) *Note, you can see that the cactus is doing much worse in the second photo than in the first. It has lost many "leaves" and it's stem has shriveled.