Hi everybody! I have a new terrarium that I created for Nepenthes hybrids and Sundews. I started with a few Sundews, N. spectabilis x mira, a Sun Pitcher hybrid, and some sphagnum moss. Everything was growing great, then I got a new N. glabrata x hamata for Christmas and it has put out almost no growth. I decide that I needed higher temperatures during the day as the temps in the terrarium stays in the upper fiftys. What type of heater should I use? A heat pad or rock? The dimensions of the terrarium are 14.5in x 36in x 12in. Thanks!