Hi everyone!
So i recently bought a house and after a couple years of renting and not being able to own a tank

i have decided to rekindle my passion of owning a tank! I bought myself a 29g biocube and started my first SW set up....the only problem is now i wanna step it up a notch and get into a larger tank!!
I have a pretty good idea of what i wanna get (80G-110G with sump and MH lighting) and have seen some good deals on craigslist but i am unsure what to look for when buying a used tank. I was hoping if you guys could give me some advice on what to look for and maybe a couple tips and making the big step
i am fully aware of the work i have to do to keep a large tank healthy and happy as i have house sat for friends for months at a time and they own a 135G reef tank.
cheers everyone!
P.S If your selling let me know!