Yeah, another clue to make an animation less noisy is to use keyframes to make the "Seed" for the rendering tick up for each frame. So if you have a 100 frame animation, you would set you keyframe at frame 0 with the seed at 0, then go to the frame 100 and set a keyframe with seed 100. That way, the noise becomes less visible in the animation. Otherwise, the noise will stay the same throughout the animation and it will be very obvious and distracting.