seal

I've got some old T5 bulbs that have been in storage for possibly over 10 years, and some of them might not have ever been used. I want to use them now but am concerned that the seals keeping the mercury vapor inside might be compromised after such a long time. Any thoughts?

So a while ago I concluded a leak test of a 120 gallon tank I got secondhand, there weren't any leaks over the course of around 4 days. Because of preoccupation with work school/work (I'm a graduate student so they're kind of the same thing), I've kind of left the tank sitting dry for a while...

So I've just recently noticed that the seals on a 120 (2' x 4' x 4') gallon tank that's been sitting empty which I got secondhand are potentially in bad shape in at least one spot; I was able to get my fingernail underneath one of them and pull it a tiny bit, which from what I know is a sign...

Ok just sealed my 265 and day by day i have added water and it is now full. I am planning on waiting a few days before i drain it (a few times) so that all toxins are gone. So now my question is if cycling it in my way will be good enough or should i do this dropping ammonia in it and watching...

So..i just bought this aquarium and i dont know if this is a bad seal..or what it could be. If i had clear silicone it probably wouldve gone un noticed..please help me out .