This anemone disc is the size of a toilet seat with the tentacles its huge, I've had this anemone since it was smaller than my hand. It is attached to a premium 20-40 lb live rock..it commands a lot of room...i will try to include pics with scale. the tank in the pics is 6 feet long and this is an older photo, the anemone isn't fully open either..shes a big girl, never split, eats like a pig..