Crazing in acrylic aquarium

[DampLlama]

Trying to figure out if this is a problem or a normal occurrence in a large acrylic aquarium. If a problem, how do I fix it? Tank is 8'x2'x2' 1/2" thick acrylic

I'm in the process of cleaning and refinishing the stand so it's dry and won't be filled for 2 months so I have a little time to fix. The tank was filled and running flawlessly up until a day before I bought it. Seller never noticed the crazing but I'm paranoid of leaks so I noticed it. Any help appreciated!

 

[vetteguy53081]

Not uncommon
In many cases sanding with 800 and 1200 grit wet sandpaper will finesse it followed by clay
When water is in tank, it is camouflaged