A few weeks ago I got this plant from someone:
Sadly it looks like it is dying. What kind of plant is this? I have been watering it twice a week, keeping the soil moist. What did I do wrong and how can I save it?
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This plant is an aloe. It's a desert dwelling succulent. In warm weather they can handle being watered once a month, sometimes more often in HOT weather. Indoors they can often go several months without water before they complain. If they're watered frequently they start to suffer from drowning and root rot very quickly. The lower leaves of your plant appear yellow, but still very plump, this is a typical succulent response to over-watering.
To save it: stop over-watering. Most of the leaves still look fairly healthy, just give it a nice warm sunny window and it should recover.