sinibotia
Aquarium Advice Addict
Why not a pair of gold occies? They are pretty colorful, especially the male's breeding colors.
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Occies would be good, except that from my understanding they pair off like typical cichlids which means you eventually have to find a way to deal with fry. Multies are colonial and the fry just join the colony, so you can get away with a lot more multies in a smaller space to a degree.
As for hardiness, mine have survived heater malfunctions that swung temperature up to 85 and then down to 60. They're not sensitive to water quality either.