I am in the minority as I only buy brand new.
if the tank is small, which usually means not to expensive, so its not worth it to me to buy used and have to worry about the increased risk of leaks, tank failure etc.
if the tank is large, I want maximum quality with the lowest risk so I want brand new.
there is no in between for me I guess LOL.
yes, even brand new tanks from the LFS can leak, break etc.
but this risk is significantly lower. with a used tank, you really don't know what the tank has been subjected to before you get it. 99% of the time the seller is going to tell you exactly what you want to hear to make a sale..
was the tank ever dropped? heck no
was the tank left out to dry in the sun? heck no.
right...
also, if you are particular about your accessories, buying new is the best way. otherwise, you buy used but then spend just as much upgrading the lights/filters/decor etc to stuff you actually like
