It was up and running when I got it, I just noticed bubbling after it had been empty for two weeks at the house. I'm aware it's a big hobby no no to partial a silicone repair which is why I used GREAT attention to detail when stripping it. Honestly I never buy used unless they look new. I told my wife I think she's just giving me a mountain to see if I'll give up the hobby lol. Never taken a break in 10yrs, no need to.