Building a Carnivorous Plant Terrarium: Drainage, Lighting, and Soil

Step-by-Step 10-Gallon Terrarium from an Experienced Hobbyist

A beginner planned a 10-gallon tank with 2" gravel, peat moss, and tropical sundews + P. primuliflora.

Dan's Terrarium Formula

• Drainage: 2" gravel + a low corner "drainage pathway" to monitor/remove excess water.
• Soil: Only long-fiber sphagnum moss (nutrient-poor, holds water, resists breakdown). Pack to 10" below rim.
• Lighting: Three 4-ft double-tube fixtures with Philips "Plantes et Aquariums" F40 tubes (six tubes total) over grouped tanks. Timer for 16 hrs light.
• Environment: Humidity <80%, temp ≤84°F, night drop ≥15°F. Ventilate.
• Plants: P. primuliflora (prolific), D. spatulata, D. adelae, D. capensis, D. binata, D. burmannii. Avoid overcrowding.
• Feeding: Fish flakes + water via eyedropper monthly; tiny amounts to avoid mold.

Follow-Up: Natural Look vs. Plant Needs

Dan started wanting a natural look but learned plants have different needs—placement follows requirements, not aesthetics. Temperate plants need removal for dormancy. Lighting distance (5–6" from tubes) is critical.

Soil Clarification: Only Sphagnum Moss

Peat mixes, sand, gravel cause mold. Long-fiber sphagnum packed well lasts years. ZeroWater filter for cheap pure water.

Final Tips: Measure, Ventilate, Leave Alone

Buy an $8 temp/humidity meter. Use a cover to control humidity. Don't touch plants—stability is key.

Happy Growing,
Dan