I am fairly new to the aquarium world and am getting pretty confused. I have been randomly having fish disappear, and have no clue where they are going. A total of three have now disappeared, and I cant find them. They are not in the tank, or anywhere around the tank. I dont really know much about the system other than how to turn everything off and on for the monthly cleaning, so I am wondering if there is someplace in the tank that they could get sucked in to???