I saw a chart that showed the make up of the saltwater and how parameters changed over time, some were negligible others like coral pro were significant, that's why I changed to Fritz. I always heat to tank temp, stick a pump in my brute facing up so I get a good flow going and toss in the salt, typically one cup at a time until I get my 30g mix, hour or so later, test to see if it is close to tank then do the change or the next day, but I always feed my corals with polyp lab or frenzy first, then do the change. Works for me, everyone will have their own process. One week I drain from tank, other week from sump, general maintenance I guess.