I have a 16" silver aro that doesn't show any signs of drop eye. at what size or age would it start to show. I know diet is believed to be one possible reason and it has seen nothing but frozen krill and frozen silversides. It started out in a 125 Gallon and is now in my 396 Gallon i have heard the size of the tank could be a factor. Am i in the clear with this or is it still possible... i have recently purchased a 13" silver with bad drop eye and i hope over time it starts to improve.