no.
not acurate.
In theroy, Saltwater tanks should be able to be a totally enclosed ecosystem that completely takes care of itself. But for probibly 95% of us out there, its more of a constant struggle to keep our system from crashing.
Example: I have been fighting
cyano bacteria for several months now. I have researched, researched, researched, for months on end. I make changes, and note the results. then I make another change, take notes.
I adjust the temp, adjust the lighting schedule, adjust my filter media content, adjust my food prep and feeding habits, add more cleanup crew of varying species, add certain chemicals to the tank,etc. etc, etc, and all in small incriments because any big change could throw your system out of whack and cause major distruction.
However, advanced hobbiests who have done it for many, many, years and who know their tanks unique system needs, and who have very large systems, Often have systems that require very little maintance at all... Just regular daily feedings of all fish and corals, clean the glass every other day, sift the sand bed once a week, change 5% of the water a week, dose with chemicals every day. (unless special eqipment does it for you) top off the tank every other day, trim the plants in the fuge back once a week or so, check all parameters once a week, check and clean all equipment every month, and probibly a host of other chores that I do not even know about!