i honestly wouldnt stress about it, remember when you bought it you even water tested it for a week or more.
if you need to feel better about used tanks go talk to gary at sealife, he'll boost your confidence forsure,
his 500g there in front hes sealed himself and its sitting 1'' not level and he doesnt even worry about it lol.
think about how many people are on this forum, for how long?
and how many of them have had leaks....
me and one other guy that had his bottom glass pane burst out.
im strongly considering going used again, even picking up this week.
just gotta look for obvious issue and balance the tank properly.
dont stress about it
