Hi, and welcome to the Forum!
Even though your tank is bigger than 10 gallons, it's still too small. For tortoises you need a bigger floor space, and the gallons in aquariums are measured by how tall the sides are. You don't care about gallons, you want a big footprint.
Also, the screen filters out the beneficial UV rays the light gives off. It shouldn't be sitting on the screen.
You have a beautiful tortoise. What a nice Christmas present.
Even though your tank is bigger than 10 gallons, it's still too small. For tortoises you need a bigger floor space, and the gallons in aquariums are measured by how tall the sides are. You don't care about gallons, you want a big footprint.
Also, the screen filters out the beneficial UV rays the light gives off. It shouldn't be sitting on the screen.
You have a beautiful tortoise. What a nice Christmas present.