Hi all, I was hoping someone may be able to help me with some nautilus I have in my lab at the moment. They seem to have lost the ability to control their buoyancy, they all just tend to float at the surface. Other than that they seem absolutely fine health wise. From reading around it seems that this is quite a common issue in captive nautilus, however I have not seen any potential solutions other than a "wait and see approach". I've had them for around 5 weeks now and they are still having buoyancy issues, so I was wondering if anyone had any experience with nautilus and perhaps had a solution or treatment that I could try? At first I thought that the tank might be a bit shallow, its a rectangular cuboid and is only around 70cm deep, could a lack a vertical swimming space be an issue for them? Any help would be appreciated.