* Space: Turtles need space to swim, explore, and bask. A 20-gallon tank is simply too small for a 7-inch turtle to thrive.
* Water Volume: Larger turtles need more water to maintain water quality and prevent overcrowding. A 20-gallon tank wouldn't provide enough water volume for a 7-inch turtle.
* Basking Area: Turtles need a dry area to bask and regulate their body temperature. A 20-gallon tank might not provide enough space for a suitable basking area.
Recommended Tank Size:
For a 7-inch turtle, a tank with a minimum of 55 gallons is recommended. However, the ideal tank size would be even larger, depending on the specific turtle species and its growth potential.
Remember:
* The size of the turtle's shell is not the only factor. You need to consider its overall length and the space it needs for swimming and basking.
* A larger tank is always better. It provides more space for the turtle to live comfortably and prevents stress.
Before getting a turtle, it's crucial to do your research and ensure you can provide them with the proper living conditions.