I have decided to adopt a young GSP that my friend can no longer keep. He is young and currently in a very small freshwater tank. I need to switch him to brakish water ASAP. I have a 20 gallon tank, filter, heater, marine sea water, gravel, snails, and biological booster. I am aware of the level of salt needed and proper temperature. I know that the level of salt will increase over time. I am concerned about how quickly I can get him into the tank. I was planning to use 15 gallons of RO water and 5 gallons of marine salt water (measuring the right level of salt for a fish this young). I was also planning to use the biological booster and run the filter without the carbon for one hour. I would then add the GSP to the tank and replace the carbon to the filter after 24 hours. I intend to do 25% weekly water changes. Does all this sound right? I want to transfer him as soon as possible. Thanks so much!!