My first bichir a Delhezi just died because another fish ripped off the pre filter and my bichir got his head stuck inside the hose which was a siphon so he was vacuumed onto the end. The seal was so strong I had to cut the pipe to get him out. I tried to revive him by allowing oxygenated water to flow through his gills but his head was red after being sucked. He was getting big too around 5-6 inches and an overall chill and happy fish. I buried him in the backyard with some tiles to mark him.
