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Guppy
Temperature: 17 – 28 °C
pH: 7.0 – 8.5
Hardness: 90 – 536 ppm
http://www.seriouslyfish.com/species...ia-reticulata/

Zebra danio
value of 18 – 25 °C should suffice meaning a heater may not always be required.
pH: 6.0 – 8.0
Hardness: 90 – 357 ppm
http://www.seriouslyfish.com/species/danio-rerio/

Neon Tetra
Temperature: 21 – 28 °C
pH: 4.0 – 7.5
Hardness: 18 – 215 ppm
http://www.seriouslyfish.com/species...irodon-innesi/