Mold in Tank?

[ezil]

I can't tell either, but looking at some of the leaves, I think you also have a bit of rot going on. I have a few terrariums myself and one of the most important things is ventilation. Do you have a little fan in yours? If not, get one or you'll have the same problem again soon. If you have ventilation, check if there are areas with stagnant air. Also: mount a hygrometer and a thermometer in the tank, so you're familiar with fluctuations. Sounds like work, but really it's not. Keep us posted.