My roommate going back about 20 years had a saltwater tank. If I remember correctly we had 7 or 8 tanks in the house, the rest were fresh. We had a pretty cool variety, but my memory ain't so great.
That's when I got hooked on cichlids. I loved his saltwater tank, but I saw how much time he spent working on that tank while the others were so much easier. I went the easy route, hahhaha.
I've kept some other stuff too, but mostly cichlids. I had piranha, a fresh-water sting ray, a snakehead and a few catfish I can't remember which though.
I've just got a single 75 gallon now, and this will be my last aquarium setup. Hopefully my fish still have some years in them, but when the time comes I won't be setting up the tank again.
I still enjoy the tranquility of the tank, but it doesn't excite me like it used to.