So I purchased a GBTA from a fellow member and in his holding tank, 1. it did have bubble tips and 2. it was definately green but 3. it was small (unexpanded). Now it's been in my tank under great lighting and current for about 3 or 4 weeks. In that time, the bubble tips have gone away (I understand this to be normal) and it has fully expanded when the lights are on...looks great this way....but it's no longer green. It's now more of a pale brown color. Is this normal? It wasn't on a rock when I got it but it's definately attached to one now and seems darned happy right where it's at so I have no intentions of moving it. Just wondering if the color will ever return.