So what makes an extreme coral an extreme? The fact that it often dies after it's fragged? Availability? Price? Slow growth? Well the green crossettes fit this, except price and maybe availability. Try and find some locally, go ahead I'll wait. These have grown a polyp or two in the eight months they've been in my tank. I try higher lighting, they don't open up as much. I try lower lighting, they don't open up as much. Same with flow, nothing really makes them happy. I fragged 5 polyps for my 3000 posts dbtc, and 3 died. The two that made it really aren't looking all that well. So, does this make it an "extreme"