I came across a green and orange Acanthastrea frag this weekend. I really liked it, but not knowing much about it I decided to go home empty-handed. I have done some research, and I still keep thinking about it and wondering... $70 for a 2"x4" frag? I've come across an eBay auction of a similar coloring but slightly smaller piece that ended at $28. I'm just not sure if the one I saw is worth it. Thoughts?