was pleasantly surprised when I connected my new reefwave 25, bought it used, but it looks brand new. It sounds like a toy boat or a drill that buzzes and goes, absolutely anything but "dead silent" in reverse it is completely silent up to 50%, in normal mode it made an enormous amount of noise, but when I put it on the lowest speed it became the quiet one. Is this normal? remember mp10 (the one before qd) and tunze vsr very quiet