Need a bit of advice here on a show fish

Jan 7, 2010
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#1
So My 16 Gallon is completely livable for fish species, Ph is at 6.8, ammonia, and nitrites are at zero.

So far I have

6 Zebra Danios
1 African Dwarf Frog
2 Otos
4 Albino Corys

I have enough room for a show fish or two, So which fish would be best for my aquarium?