I have been in the hobby for 4 years or so then I got out of it and now I want to get back in but I am not sure what size tank I want. I had a 75gal before but that was when I lived at my parents. Now I live on the third floor of an apt and I know that this place cannot support a large tank. I was thinking a 30gal but im debating. My main worry is that the tank will fall. I worry because my buddy had a tank in his apt next door to me and every time you walked by the whole think swayed. What do you all think?