Barrel rolling/ spiralling through the water is either a bacterial or protozoan infection in the brain. Protozoan infection is more common and both are caused by poor water quality and dirty tanks.Ah ok. I’m just going by the description in the product manual. I noticed some barbs and Corydoras turn their body whilst swimming. Sort of like a barrel roll a few times.
Cleaning the tank and adding salt is the best treatment for this but if the fish is too far gone, they don't recover.