Although I have never grown N. Talagensis, I have several other highlanders on my grow list. What many people often forget is that it naturally gets cooler at night time anyways. Unless you're growing an Ultrahighlander like N. Rajah, N. Villosa, or now even N. Edwardsiana!!! (Wow!) I have found that the natural temperature drop that is experienced indoors is enough. Beyond that, if you are growing plants under grow lamps, simply turning them off at night will produce a several degree temperature drop, depending on the lights and distance they are from the plants. Although there are several plants that are incredibly picky, I think you will find over time that they are hardier then many people think they may be. No terrariums needed! Thats for sure!