Depending on it's age, everyday or every other day. Start out by giving it 4 to 5 crickets at first, if it's still looking for food add a few more. After 5 to 10 minutes take the leftover crickets out.NEVER LEAVE CRICKETS IN THE TANK! The crickets will bite your gecko. I know, my Leo has a big bite on the left side of his nose. If you do accidentally leave them in the tank, and your Leo gets bitten, it'll be traumatized and refuse to eat crickets again.