If its eating like a pig then perhaps they should try feeding it more,if they tell you it gets regular feeds then its likely to have worms.Either way that ray needs a month to six weeks before its ready for sale,that way you will know if its condition is terminal.Far too many Retics perish within the first week or two of purchase,its not that they are that difficult to keep it because too many shops without the necessary knowledge stock and sell them............................its a crying shame!!!!