Does my tank need to be resealed?

[I_Got_Crabs]

I bought a user 65 gallon tank. It says made in 2017 on it (Aquarium Masters), and the previous owner who appeared to be an honest person (e.g., informing me that he had used copper treatment in the tank). The black silicone seals on the inside don't all look pristine but I really don't know if they are done. They are definitely not dry or flakey, but some parts do peel back a little (especially when using shape edged algae scrubber).

Plus one of the ouside corners (pic 3) looks like it has some sloppy clear silicone application and I wasnt sure if this was when it was made, or if it looks like a sloppy repair. If someone with experience and trained eyes can weigh in on this I would very much appreciate it!

 

[Reefing Madness]

The sloppy silicone you see inside doesn't bond the glass together, its more or less a peace of mind seal. The silicone inbetween the glass is what holding them together.
Run the tank with fresh water and a ton of carbon, the copper in the glass is finite, you can get it removed.