Personally I think a large sump reduces maintenance and also creates more room for error in the event of a lapse in maintenance. I also think that it makes water changes easier as i pump water in and out of the sump without turning anything off. Filtration wise, the sump gives live rock filtration and macro algae filtration. I have no filters to change, just emptying the protein skimmer. So basically water changes, water fills for when the water evaporates and emptying the skimmer. I do advise though that I did purchase a RO
system and keep the water ready to go into the tank in Brute garbage cans. One for the salt mixture and one for fresh water for evaporation. I do a 25% change every two weeks. Things remain pretty stable.