I would personally go for one of the many fairy wrasses available. Great personality, easy to care for and very showy. Red Velvet Wrasse, Carpenter's flasher wrasse, Lineatus Fairy Wrasse, McCosker's Flasher just to name a few :-)
I would try not to get too big a fish for the 45g. A larger fish to me would feel out of scale with the smaller 45g tank. Not saying it can't be done. Just my opinion :-)
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