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161 Posts
I throw very little away so...

If you can return, that would be option #1

If not...

Once the fish are out, a little food coloring in the water will possibly help you track the leak.
Turn off everything so the water is calm add a few drops and see where it goes.

I have used DAP all purpose 100% silicone with no problems.

I have resealed 10 or so tanks over the years.

If it were mine... I'd try to return it, if that didn't work, I'd redo the seals.
My seals tend to look better than factory anyway and I have the opportunity to use black or clear.
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