Succulents are desert plants, and do best in a dry habitat with good air circulation. This is why we only make open terrariums, closed terrariums promote high humidity, which may be good for some tropical plants, but are certain death for succulents. Succulents like indirect sunlight and lots of it. A spot next to a sunny window or skylight is best.
When watering succulents, we like to err on the side of total neglect. Overwatering a succulent is a sure way to kill it. If you want to be a total succ-up, (heh) use filtered (not distilled) water, or leave a jug of water on the counter over night which allows the chlorine to dissipate, and succulents do not like chlorine one bit. Room temperature water is best, as cold can cause shock.
Water well and infrequently. If you see water pooling at the soil level, that's too much water. Let soil go completely dry between watering. Frequency will vary according to the temperature and humidity in your home, but a good rule of thumb is to water once every 3-4 weeks. Remember, it's always better for your succulents to underwater than it is to overwater.
Air Plant Care
Air Plants, or Tillandsia, are epiphytes which are a type of plant that receive their moisture and nutrients from the air, rain, and sometimes from debris accumulating around it. They do not require any soil or growing medium.
Take your air plant out of its home and submerge for 2 to 3 hours twice a month in room temperature filtered water or tap water that has sat our overnight (allowing the chlorine to dissipate). Allow it to fully dry for 2 to 3 hours before placing it back into its home. You can also mist the plant with water right in its container once a week for a boost of hydration. 2-3 sprays should be adequate.
Air plants like bright filtered light. Do not place them in direct sunlight, as this will cause them to dry out too quickly.