My interest in aquariums started as a kid, when we had one in our classroom. We lived in Amsterdam and those were the '30s, so my parents were too poor to get our own.
Many moons later when visiting clients at home as a Govt. health insurance guy, I saw many tanks with many different fishes. I got the money together an bought an old leaking steel frame, double glass tank, with a home made plywood hood and two light-bulbs to heat the water.
It also had a concrete like back wall, with niches/pouches to put plants in.
I fixed (?) the leaks with window putty, got some river sand, washed the heck out of it, and filled the thing up, holding my breath. It did not leak, but I feared for the effects of the putty. When I told my clients about the now filled and water-aging tank, I got plants from every side, advise from more sides, and a variety of fish I did not even know existed. One or two at the time.
I had taped a fever thermometer to the glass on the inside, to keep an eye on the water temperature. As soon as the temp reached about 70 f. my wife would turn off the lamps (I would be at work).
One day, she had a rough time with the kids, and when i got home most of the fish were cooked. :-(
Started from scratch, and even bought a thermostat controlled immersible heater.
When we left for the U.S. i gave the tank to a family member, who promptly dropped, broke it, and tossed it.
First few years in the U.S. no aquarium. Too busy holding two jobs and going back to school. Next, small one, later bigger ones, up to the present 20 gallon.
So far so good. I have read up and learned and unlearned a lot, but still don't really know anything. Just go by guess and by golly most times.
OK. That's me. I am now 85 and will be picking your brains to keep the fish alive at least as long as myself