Bests & Worsts Reviews from Amazon

I bought this a little more than a year and a half ago for my daughter for her birthday in April. At first, it was fantastic until it started to turn brown. It is disgusting and I have been trying to get her to throw out for well over 3 months now. See pics. I don't know how long this ecosphere should last but it clearly is a temporary gift. Yes, she followed the directions, she is in college. Very disappointed!