All the plants in my terrarium are doing great except my Staghorn. What's odd is that is gets all the same treatment that my other plants do. Same light, same water, same air, everything. Yet the tips of the leaves are turning black and there isn't an abundance of dew. Also, some of the stems are turning a reddish color, but I think that's just what sundews do when they get rid of old leaves. Last but not least, my Giant Staghorn is the only one of my plants that hasn't shot up new leaves since I got it. It still has all the old leaves, but perhaps this is because it's a bigger sundew and doesn't produce new leaves as often. Please help!