I notice that when I am feeding my aggressive tank, the lion is always bumbing into other fish, and other fish into it. Including my SFE. From my understanding it is like the barb on a stingray. Just the fact that the tail touches you does not mean you get barbed, it is the action of protecting itself that barbs you. Is it during feeding time that you niotice this happening?
By the way welcome to AA
Mit freundlichen GrŁŖen