Hi all. I have a 150g DT and a 75g sump (which I maintain at 35g) my DT has three fishes, a couple juvenile Vlamingii and a juvenile Hippo tang. Tank salinity is 1.021. I plan to start reefing in 6 months time so I would like to gradually increase the salinity to 1.023/4 for my fish to get acclimated when I start putting in coral. I need help to how I should gradually increase salinity without shocking the fish already in the DT? Any help is appreciated.