thanks for the reply. I have never seen those brackish damsels at the LFS. I currently have 2 GSP and was wanting a tankmate that could hold its own with them and I have heard that these damsels can be put with aggresive fish. I don't think I want to go full salt though. How much more difficult would full salt be than high brackish? I assume a protien skimmer, and live rock would be needed on the marine but not the brackish, is that correct?