My RES has had a fake frog in his enclosure since I first got him 13 years ago. For the past 7 years or so, he has done the fluttering thing with his hands in front of this fake frog. I've even witnessed him resting beside it many times. A little research was done, and I discovered that this behavior can either be a mating dance or sign of dominance. I'm here to ask the turtle community if they think that keeping the fake frog in the aquarium is either stressful or harmless. Thank you in advance for any input!