Is this tank okay to fill with 7-8 inches of sub?

[Arkos]

So I got a 100? Gallon tank. It's measurements are a little odd, being 60x18x19. Anyway it's missing a top brace and the middle is questionable at best. The tank was only $50 so I would be willing to fix it up if possible. However it would be nice if I could just fill it after cleaning. Let me know what you guys think, here's the photos I was given from the ad. I can go take more if you guys need.

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