Water changes are easy:
Step 1: Open 2" drain.
Step 2: Watch water level drop.
Step 3: Close 2" drain.
Step 4: Open fill line.
Step 5: Watch water fill.
Step 6: Close fill line when full.
It's not exciting to to the regular changes. Right now I try to do about 400 gallons a day (single sump worth) to keep the water stable and it cuts back on needing massive amounts of water at once. I can do big changes, but limit those to 'need to' basis only. It requires isolating the sump so I can keep the twin fluidized beds and pt skimmer running and draining water right from the tank.
Update on the tank for this week..... my main collector brought up a couple hundred fish from the Keys for the tank to restock the grunts that the white tips have picked off over the past couple of months. You don't realize how empty it's looking until you add a big group again.