DISASTER: There's a crack!

Hey fish fam. I found a crack!
It's ok, it doesn't really matter. But I do want to talk about why it happened and how it could have been avoided.
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[@securitycameras461]

Your tank is super awesome

[@bognare]

Did you put holes on your acrylic all around and used screws? Or just the silicone to seal them? Thanks..

[@MischiefandFins]

I just used silicone. The windows themselves rest on the actual frame of the tank, so there's no weight to support, it's just acting as a gasket.

[@bognare]

@@MischiefandFins great info I'll do that. Your opinion is very valuable if you can please tell me your thoughts.
I want to build a plywood tank of basically the size of the plywood that would be 4x8 and 3/4 thick with frame on the outside, not sure if I should put fiberglass in all seams or plywood unions, and then just cover in macropoxy 646 and placing a front acrylic 1 X 40 X 88 and have 2 in of space for the silicone. So actual view would be 3ftx7ft and design is basically just a rectangle using overall the size of the plywood that would be 4x8 front back and bottom and 4x4 on the sides. What do you think and pointers I would really appreciate...