They are similar. The Palmer’s is more of a lighter blue with almost a brownish polyp. The Sapphire is a deeper blue with green/white polyps which give it an incredible shimmer which I find to be impossible to take a photo of. I needed some space for new acros and ended up selling off my entire Palmer’s colony. It was one or the other and I preferred Sapphire.Do you have any good photos comparing your palmers blue milli and sapphire milli? I love both but sometimes have found it hard to tell them apart and even seen some say they may be the same strain. Curious on your thoughts.