I've never seen such a 2-tank arrangement but it seems to me that it could look odd in the center where the 2 abut. If either glass pane was dirty there would be an obvious visible partition. If both panes were clean, there might be odd reflections still making a visible partition.
On the other hand, this arrangement could allow you to keep some animals that you otherwise might not keep in a full reef.
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Once you accept the Universe as matter expanding in to nothing that is something, wearing stripes with plaid is easy. A.E.
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