My total water volume is about 8 gallons which is why I usually do 4 gallon water changes. When I first switched to ESV I drained my tank and refilled with fresh mixed ESV(I was battling a case of neglected tank syndrome). The temperatures of the tank and new water were the same and nothing showed any stress that I remember. Since then I've always done at least 50% changes because I target feed a LOT of cyclopeeze every other day. Algae gets out of hand if I don't. As long as the new ESV water is the same temperature as my tank the corals and clownfish never show any stress at all.
You should be completely fine with 2-3g changes.
Since with the ESV I can make every batch identical to the one before with a digital scale, the only difference between new water and tank water is the nutrients removed and Ca/Mg/Alk replaced...less of a swing than if I were dosing and parameters stay at optimal levels.
Hope this helps.
yes it does thanks. as of right now i dont have a digi scale. so im doing it by vol. until i get one @ walmeeze