I picked up about a 3"x4" piece of rock covered in green star polyps today and only 2 of them had opened up in the past few hours or so. I read they are very hardy but can be picky. I'm worried maybe I didn't acclimate them long enough. About how long should it take for them to open up? I use the same lights they do. And as far as care, light, flow, & placement what would be best for these?