How to Build a Terrarium Tank

Cover the base of the aquarium with aquarium gravel to create a drainage layer for the terrarium tank. The gravel should be at least two to three inches deep to provide enough space for excess water to drain in the terrarium.

Add a thin layer of charcoal over the gravel. Charcoal maintains a sterile growing environment in the terrarium tank and helps prevent unsightly fungi and algae from developing on the gravel.

Place 3 to 4 inches of the growing medium over the gravel and charcoal. The type of growing medium you should use varies with the types of plants you want to grow. Use a peatlite potting mixture -- which contains a mix of peat moss, vermiculite and perlite -- for tropical plants such as bromiliads, ferns, earth stars and ficus. A well drained mixture of sand and garden soil works well for desert plants such as cacti and succulents.

Arrange the plants for your terrarium outside the terrarium to find a arrangement that you like before placing the plants in the terrarium. Inspect the plants carefully and remove any yellowing or dead leaves before planting.

Remove the plants from their potting containers and place the plants in the terrarium tank, starting in the back and working your way forward. Ensure that the roots are completely covered with soil and water lightly once all the plants are in the terrarium.

Add driftwood, rocks or decorations to accent the plants and create a natural appearance in your terrarium tank.