I don't agree that the maintenance is harder.
I have three tanks.
- One is a 65-gallon tank with about 60 lbs of LR, a 3" sandbed, some soft corals and about 6 fish. I use a wet/dry filter with a built in skimmer. Weekly maintenance = 1 1/2 hr.
- One is a 7-gallon nano tank with 10lbs of LR, 2" sandbed, 1 fish and some soft corals, Prizm skimmer. Weekly maintenance = 1 hour
- One is a 210-gal reef tank with 300 lbs of LR, a 4" sand bed, plumbed through the floor to a sump in the basement, an external AquaC skimmer, chiller, refugium, dual return pumps, 8 fish and some corals. Weekly maintenance = 45 min
Guess what? The easiest tank of all is the 210 gallon. The hardest is the 7-gallon.
Larger tanks have more water, and are more stable. That is part of the problem with the 7-gallon tank. 1 oz of excess nutrients in 7-gal is MUCH worse than the same 1 oz of excess nutrients in a 210 gal. Vacuuming the 7-gal is qucik, but hard since it is hard to get to open sand. The 210 is so easy my wife does it every week!!!
But alot of it has to do with how the tank is setup and stocked. I have a better cleaner crew in the 210 than the 65, the equipment is more accessible, and I have better equipment on the 210. Hence, the tank is more self-sufficient, easier to maintain, and more stable. Water changes are a piece of cake since the sump is wide open and the RO/DI water is 10 feet away. For the 65-gal, water changes are upstairs and the RO/DI until is downstairs.
What I am trying to say is that the answer is more in how the tank is setup. The better the arrangement and forethought into how you will do things like water changes, vacuuming, lights, etc, plus investing in good equipment will make any tank easier to maintain. A poorly thought out and arranged tank is a nightmare, no matter what size it is.
Understand though that bigger tanks mean bigger expenses (bigger sump, bigger pumps, more rock, more lights, bigger skimmer, more livestock, more salt, more water, etc). Gee, no one told me that little secret when I started!!
My recommendation: Go as big as you can afford to set up properly and support over the life of the tank. Not just to setup, but to maintain as well.
Good luck,
Rick