Sorry for the misunderstanding but I was referring to saltwater purchased from a LFS not what they run their systems at. I would expect purchased water to be closer to 1.025Not really.. that's only about a cup and a half or so of salt to 30 gallons of water. My LFS, runs 2 of their tanks at 1.020 full time. Doesn't seem to hurt the fish, but does make it a longer process to acclimate to my system.