Hi guys! I have 4 eels, I am attaching a video where you can see one (the newest) turning over in the tube. None of my other three eels do this or have started doing this. My question is —is this normal? The tank has been going 11 months now, I added the yellow 1 week ago.I did a water change three days ago, my salinity did drop to 1.020 and I’m working on salt water now to start to raise that. But I’m concerned with this action of the yellow head. Please advise