Build an Aquarium Terrarium You\u0026#039;ll need these materials: A small to medium size aquarium Charcoal (finely ground) Small pebbles Perlite Soil mix Assorted small plants, such as ivy, mini-african violets, small herb plants, or cacti Glass or plastic for top What to do: Wash and dry the aquarium. In thin layers, add the charcoal, pebbles, perlite, and soil. Make the soil deep enough to support a small plant, approximately 1 1/2 to 2 inches deep. Water plants well and remove from their containers. With a teaspoon, dig a small hole for the root and plant the herbs, flowers, and small plants. Do not put them too closely together. Now it\u0026#039;s time to go out and find insects. After you collect the insects, put them in your terrarium. Cover the aquarium with a screen top. Place in light, but not direct sun. Water only with droplets since this will be a moist environment. Enjoy watching it grow.