Rapidfire thoughts:
A triangle sounds like lots of fun.
It sounds like you're making the bottom way too complicated, why not just use glass?
Although I have zero experience building tanks, I would personally try to get the glass beveled. All you need are two beveled edges, and they would drastically increase the contact area that the silicone has with the glass.
Rather than exterior bracing with a strip of acrylic, I would think that a strip of glass fitting tight into each corner on the inside and siliconed in place would add much much more structural integrity.
Happy reefing
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