I used a 75 liter bin when doing larger water changes. 2 identical low powered pumps running into the sump and one running back into the bin for a couples or hours slowly changes the water with no stress to fish are corals and less mess to clean up.
I also turn power heads and return on max and add some micro pad to stir up and polished the water
I also turn power heads and return on max and add some micro pad to stir up and polished the water