

For no reason its stopped eating and is thinning as a result. There are no marks on it, colour/markings fine and no sign of fin damage. It has its normal activity level too. Nothing bothers it (its the biggest fish in the tank).
Parameters are fine and haven't changed since I got it-the other Polys (Del, Senagal & Buett.) all eat fine.
My concern is remembering a recent post (by 'Keeper of the Ropes') on losing WC Nigerians after 1-2 months and wonder if mine is doomed to the same fate. Or do Endlis do this from time to time? Other than it being skinnier than normal you wouldn't know anythings wrong.
Any help or suggestions really appreciated
ROB