is romaine lettuce bad for my tortoise

[BirdieF18]

Hi i have a new hors field tortoise i have heard everywhere that iceberg lettuce is bad for your tortoise. I have deliberately avoided it but i am just wandering can i feed my tortoise romaine lettuce. I have made up a table for what my tortoise eats. It is a different fruit and different plant and vegetable everyday. I also add calcium powder on my tortoises food. can someone please tell me if i am doing anything wrong.