you do need to be careful that the top of the tank does not bow out when filled. the black rim acts as a support to prevent this from happening. if the tank is over 19" tall, you could have issues depending on how thick the glass is.
it's up to you if you want to take the risk, but the top of the tank will bow out, unless it's braced. water will want to push out at the narrowest part, which is the front to back glass top edges.
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