^I have a 60 Gal across the room with my tropical turtle in it so I don't have much room right now. I had a 125 but I had to sell it. I'm moving out within the year so i'll end up tearing this one down before I have any size restraints.
One time a tropical fish store was going out of business, so I bought 7 tanks of fish from them and I had 9 tanks set up in my house at one time!
Too many, but I couldn't pass up a bargain. Anywho, I've had fresh water, salt water, and illegal fish. I've had a fresh water stingray and an octopus that I hand fed. What made the hobby so appealing to me was that I had a friend with the same hobby, and a fish store that would sell unusual fish.
Now it's getting too expensive for young kids to have and that's a shame. Fish are far more interesting than a video game, and far more educational.