Honestly.. I think the bigger the tank the better. I understand if you don't want to dive in head first, but you also don't wanna get a small tank only to get a bigger tank shortly later without wasting your money. Smaller tanks are much more unstable IMO. I started with a 36... Hated it I was always treating the tank for something. Then went to a 75... Not as bad.. Now I have a 240 and I have had zero issues now and it's been six months (other than a diatom bloom which... Happens). I have a container for extra water called an evaporation tub, and i literally never top of my tank, I simply just feed my fish. I do water changes about once a month to month and a week ish.. never had an issue with algae or sickness,parameters, etc. If you need more help feel free to send me a message.