I just recently bought two pictus catfish for my 55 gallon tank. However, two days later they both are missing. I do have to red belly pacus in there that a friend bought for me for Christmas. Which now I wish he wouldnt have because of how massive they will soon become. Does anyone know what might have happened to them? At first I thought the pacus ate them but I have smaller fifh also in the tank that were never bothered by them. So if anyone can help me figure out a solution.