Slowly raise until within .02 of desired salinty. When I have this happen, I measure my new at .02 above and take out half then replacing with the new made. I'd do this over 2-3 days or until desired salinity is reached. If off cclose to .02 you can always top off with salt instead of fresh as well, I use this method when raising my qt salinity.Hey @Duke4Life how do I raise salinity in my 29 Gallon? It's at 1.018 I thought it was at 1.023 but I guess my Refracotmeter wasn't calibrated correctly. I got a falco hawk yesterday, thinking I had the right salinity, then I tested my freshwater aqaurium for salinity and it wasn't at zero, then I checked tap and wasn't at 0. So I knew something was wrong after that. The little guy is alive. I didn't have much time but this morning I just set up a 10 Gallon in the bathroom and put a filter to circulate the water and a heater. Then I didn't have time to measure the salt so I just tossed in a few handfuls into the 10 Gallon. I did this because I know you are supposed to circulate the water with the salt instead of just adding the salt into the aqaurium. So what do i do?