How many liters should i have in a fish tank for perch?

For perch, a general guideline is to have at least 40 liters (10 gallons) of water for a single fish, with an additional 20 liters (5 gallons) for each additional fish. This helps ensure adequate space, water quality, and territorial behavior. However, the specific requirements may vary based on the species of perch and their size, so it's essential to research the particular needs of the type of perch you plan to keep. Proper filtration and regular maintenance are also crucial for their health.