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Step 1
Diagnose the disease. You may have mold, fungus or discolored plants in your terrarium. The disease may begin with over-watering, under-watering or improper lighting. Correcting the cause may not be enough to remedy the problem.
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Step 2
Wash the plants with clear water. If that doesn't treat the disease, use a mild chemical solution. Some gardeners use dish soap, while others prefer to use a professional plant chemical. Which one you choose depends largely on the problem.
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Step 3
Remove diseased parts of the plant if the disease can spread to other parts of the plant or to other plants. You can either cut out the infected part or remove the entire plant from the terrarium and replace it with a healthy one.
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Step 4
Change the soil in the terrarium. Just like you repot a single plant, you may need to repot your entire terrarium. Examine the roots as you repot to avoid excessive stress to the plants. If you change the soil, you may want to wash the rocks or grave, too.
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Step 5
Monitor the humidity in your terrarium. A terrarium functions as a mini-ecological system. Terrariums need the correct amount of moisture, but too much humidity creates a breeding ground for mold or fungus. If moisture, or condensation, covers the sides of the terrarium, open the lid and allow the moisture to escape.
