A standard 50gal would probably be as small as you would want for a room divider type of setup. Standard dimensions are around 36x18x20 I think. To keep it simple and minimize volume you could add a larger external overflow onto the side and make it a AIO type tank, no skimmer, just a decent size return pump with a tray for floss and/or carbon. ATO could be added and if you keep bio-load down by sticking with mostly inverts the maintenance will be minimal.
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