Belive it or not, nanos are harder to maintain than larger tanks imo. Less room for error. With that being said, good fish are blennies, gobbies, damsels or clowns.
With a 14g, you wont be tempted by those good looking coral eating fish like butterflies and angels because they wont fit.
The biocube will support softies obviously, and some LPS as well. It is a good turn key setup but like I said about maintenance, be prepared to monitor water conditions since the water volume is so low.
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