I don't really have any schedule. 4 or 5 times a year I change some water. I normally collect it in the sea and if it's a nice day, I collect it because who doesn't like a little time at the beach?
I just about never test anything unless I am writing an article or someone wants to interview me and I know they will ask what my parameters are but if everything looks good, I never test.
I should dose but that's another thing I rarely do. I don't have any SPS now since my invasive sponge grew all over it. (I eliminated the sponge)
I have to clean the glass every day or two or the tank will look like sheet metal.
I feed almost every day but sometimes I forget for a couple of days. Cold blooded fish can go a month or more without eating and they don't even know what day it is. When I was in Nam I had a large catfish. It died a month before I came home and I am sure no one fed it in those 11 months. He was also in about 4" of water.
The top of my skimmer gunks up every couple of months so I have to clean that and when my algae scrubber looks like a produce farm I clean that.
I don't really do anything else unless there is a flood or something breaks which rarely happens.
Of course once in a while I need to clean seaweed off the pumps.
I like to pour a glass of Grand Marnier, put on some vintage Linda Ronstadt, put my feet up and try to read the minds of my fish.
I think next month my tank will be 53 years old. I always said, if it reached 50, I would consider it a success.