Step 1: hidie holes.
Step 2: big ass plecostomus and upside down cat
Step 3: change water twice a year
Yeah, I used to have a few very big honking Plecos around in a couple of tanks, a small herd of corey cats in a couple of tanks. I thought were kinda cooler

They are cute little buggers and are busy a lot, a herd of those guys are pretty fun to have. Usually kept the same types together of course, the 4 emerald greens in the Discus tank I think were my favorite, had 4 big Discus with just those 8 in that one tank.
Hidie holes are essential for a good tank, some fish will set up home there and probably come out more often outside their spot. Having no where to call home and hide at stresses a lot of fish out. I used to have a couple of tanks in the past a large piece of driftwood placed right with live plants took up almost half the tank. I forget the name of the plant offhand, was a very cool one that grew and floated on top filtered the light and covered almost the whole top of one and the roots just dangled into the water.
One that note, something like a Gro Lux light helps a lot if you have live plants.
As far as water changes, I used to do about a partial water tank change on all of them about once a month. If you use a siphon tube and just a 5 gallon bucket to clean the gravel out while you are doing it the tank can stay in good shape a very long time.
If you do more regular water changes on just one tank once it is established, you probably would not even need a canister filter.
I only bought one myself once I had the need to clean multiple tanks with it myself. Is still one of the better things if you have the money for it short of a serious PVC filter system.
There are many good overflow ones out there that work well.
While I'm at it, I always liked using stone more than a finer media with an under gravel filter, just to get the water flow through it like it should be.
I used to have a cheap food processor I even used to make and freeze some of my food myself. Even had a Piranah tank at one time I made pureed beefheart for and kept it frozen in freezer bags
Fish love mosquito larva btw, as long as you do not toss in so many they don't eat them all. Used to have a big rain barrel on the garage gutters I'd fish the out of with a strainer net and they would go on a feeding frenzy.
The farther you get into the hobby, the more you can become involved. Like about anything I guess.
I could get a lot more diverse than that I guess, but that is basic.
Good Luck :thumbsup::thumbsup: