I have a Whisper EX 45 filter. The bottom part apparently came loose during the night. This morning, I checked on the tank and found my pearlscale oranda stuck to the filter tube by his head. He is a Hamanishiki variety so his two domes were extremely swollen from the sucking pressure on his head. His face "shrunk" from the pressure so his eyes are bulging a little and are now tilted downwards at a 45 degree angle. His mouth looks like that of a butterfly fish so I'm concerned with how he can eat. Obviously, I freed him as soon as I saw him and fixed the filter tube. He was a little lackluster at first but he is swimming more actively now.
In all my years of raising fish, I have never encountered such an accident so I'm not sure what his survival rate is. I am hoping he will slowly recover from the shock and that his face will return to normal once the swelling on his head reduces. Has anyone experienced this with an oranda goldfish?