I would not recommend for a beginner to try and raise a VFT in a Terrarium. Condensation issues, heat, moisture, to many variables that can change in literally minutes that can impact the health of your plant. I would repot in a medium size plastic pot with drain holes, 1/3 perilite, 2/3 peat moss. Thats what I did, and my previously dying VFT is doing much better. Also, put it outside in partial sun, gradually introducing it a little at a time. Use distilled water only! And allow the moss to dry out somewhat, just don't water it constantly because that can cause root rot as well. Its good to allow it to dry out a bit as it encourages the roots go grow deeper in search of moisture and in the long term, this is beneficial to the hardiness plant, and never ever use any kind of fertilizer.