Unbeknownst to me, the Aquarium Adventure store where I purchase my water, sold me 30 gallons of saltwater at 1.005. The manager said the water in the holding tank had salinty that was too high and that he would adjust it for me. Needless to say, he adjusted it. My salinity has been off a little, but I attributed it to just over-topping off with RO. Last night I did a 15 gallon water change (75 gallon tank/30 gallon sump)and my salinty dropped from 1.024 to 1.019. My corals look awful and I am totally freaking out. I won't be able to attend to my tank for another 4 1/2 hours, how concerned should I be? Please, I don't need any lectures about testing water before I put it in my tank. I have always counted on them before and had no problems. I am still waiting for a manager to call me back, I spoke to the dog/cat side of the store and that manager asked me if 1.005 is bad for saltwater and if a drop from 1.024 to 1.019 is a bad thing. ARGGGHHH!!!! Guess I need to start looking into a RO unit and making my own.