What size fishtank is necessary for 5 guppies?

A minimum of a 10-gallon tank is recommended for a group of 5 guppies. Guppies are small, active fish that need plenty of room to swim and explore. A larger tank will also help to prevent overcrowding, which can lead to health problems. In addition to the tank size, you will also need to provide a filter and heater, as well as decorations and plants for your guppies to hide and play in.