Yup, my faves although I don't keep them anymore. Dwarf Neon Rainbow fish, this looks like a female (yellow/orange fins - bit tricky to see the colours) males have blood red fins and get slightly more deep bodied.
Grows to about 6cm, shoaling, so an absolute min of 6 but do far better in groups of 10 or more IMHO. Prefers neutral to slightly harder water up to pH 7.5. A good sized shoal can be housed in 120 litres as a species tank only.
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