RIght size for a person is totally a thing. I had a 90, i dreamed of much more like we all do. I made room in the basement. built a stand for the end game tank ( 220 to 240) knew it was the only place i could put it in the basement man cave due to house design. Spent a ton of money getting it sorted, upgraded a year later to the 220. lost a ton of livestock in QT, and got a nice tank going. Then as time went on we learned that we were not downstairs as much as we thought we would be. ive now sold that off, and finishing up a 72 build that is more my size and right back where the 90 was. Sometimes bigger just isnt better.