I got a 65 gallon tank on craigslist a long time ago and never got the chance to actually use it, it's just been sitting in storage. After we're finished redecorating the room it's going in I planned on just filling it up for the first time in the house, then I realized that wouldn't be a good idea in case it leaks.
I don't think it would because the guy I got it from was really nice and gave me the tank and everything for free (so he would have told me if there were problems with it) but I don't want to risk it. And I guess maybe the sealant could have gotten weak in places since I got it or something like that.
Anyway, I'm going to test it outside first but how long do I actually leave it filled with water before determining that it doesn't leak? Is a day sufficient enough?
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