Yes, you can put an algae eater with your turtle. Algae eaters help to maintain the cleanliness of the tank by consuming algae. They can be beneficial in controlling the growth of algae in the turtle's habitat. However, it is important to select the right type of algae eater that is compatible with your turtle and can thrive in the same water parameters. Some popular options include certain species of fish, such as plecos or Siamese algae eaters, or even certain types of snails or shrimp. Ensure that the size of the algae eater is appropriate for your tank and make sure to monitor their interactions to ensure the safety of both the turtle and the algae eater. Keep in mind that turtles may try to nip or bite at the algae eater, so providing plenty of hiding places and visual barriers can help minimize stress for both animals.