i bought my nep. about 2 month and when i bought it it have a smaller nep. in the same pot. Lately i put it in a clear plastic container and cover it with a piece of plastic. Today i took a look at it and the smaller 1 fall of it leaves. The leaves is not yellow but it is green and it seem like the part that the leave sticks to the steam is desolving. What happen to it, any suggestion on how to save the little plant?