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Woolly Sundew Terrarium Heating: Aquarium Heater in Mason Jar?

A grower plans to use a fish tank heater (rated >2 gal) in a mason jar inside a terrarium for woolly sundew warmth. Asks if warning is just about overheating.

Assessment

Setup described (heater in jar inside terrarium) should work
Monitor water temperature closely
Never let jar run dry
May not be needed: Room temps in 70s°F + fluorescent lights often sufficient

Essential Tool

Thermometer IN the terrarium — know actual temperatures before adding heat.

Carnivorous Plants: Normal Fall Dormancy in Round-Leaf Sundew vs. Tropical Lance-Leaf Sundew; Vacation Watering Solutions for Sundews: No Magic Bullet; Drosera Spatulata Size Expectations: Mature Dimensions of the Spoon-Leaf Sundew; Tropical Terrarium Lighting and Lowland Nepenthes Selection for Puerto Rico; Sundew in Succulent Terrarium: Watering Conflict, Pinguicula Better Fit; Terrarium Check: Temperature, Ventilation, and Hands-Off Time; Reviving a Dewless Cape Sundew After Shipping; Temperate Sundew for Fridge Dormancy in Terrarium: Drosera intermedia Best Bet; Why Your Sundew Isn't Producing Dew: Light Requirements for Sticky Traps; Pygmy Sundew Identification and Cape Sundew Rejuvenation

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