Exactly. Sorry for the confusing terminology. I meant an ADA-style braceless aquarium with no reinforcement whatsoever - most of these tanks also feature a thin silicone seam limited to the contact surface between the glass panes vs. an aquarium with some sort of reinforcement, such as an external frame or braces along and across the top (and bottom, in large aquariums). The quality of the silicone seams is critical in braceless aquariums since it is the only element securing the structural integrity of the system.
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vs.
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ADA website info:
I don't think they use silicon.