Ok, y'all. I actually lost sleep thinking about this one last night.... Im getting my 90 gallon very soon. I live in a house that is over 100 years old. It has hard wood floors that are very unlevel. It seems strong, just Unlevel. Should I brace my floors and level them from underneath the house or just shim the tank? Ill be moving in the next month or so... I really don't want to brace the floors if I don't have to. But all the worst case scenario's kept going through my head last night... If I should just shim it, what do I use? Tips? Advice? Its driving me nuts! ( told you I was OCD) lol.