I always have my ro
water in a 5 gallon pocket. I do it most of the time in the nights, i prepare the water and I like to add a water pump and a heather to match the temperature of my other aquarium. And I keep the water on cleans milk gallons. And i have two aquarium one of them is 1.025 salinity and the other is 1.023 and the tank that is 1.023 i will like to change it to the same salinity , because i don't like to do two different densities of saltwater!! And i prefer to do the same water for both aquariums.