The ideal pH level for a guppy ranges from 6.8 to 7.8, the value found in their natural habitat.
The ideal water hardness for guppies is dGH 8-12.
The correlation between water hardness and pH is very important.
Usually, the higher the water hardness, the higher the pH level is.
The general rule for most species is to change half of your water every week so it always remains fresh and clean.
You can do this in many ways; some people recommend changing 10% of your water every day in order to keep your water in great condition.
The ideal water temperature for guppies is anywhere between 10⁰- 29⁰Celsius (50⁰F – 84⁰F).
One thing particularly important is consistency; too much fluctuation in temperature can cause significant health issues, specifically if the temperature drops suddenly and drastically.
