I'm assuming that you are feeding frozen thawed? If so are you heating it up so that he recognizes that it is food? You may need to wiggle it in front of him to get him interested. Probably best not to put it on top of him - balls (especially little ones) don't have great aim - you don't want him bitting himself if he decides to go after it.
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Tosha 
"One of these days i am going to wake up..look around...and realize my place looks more like "Ace Venturas"s than my own." Coldthumb
7.33.0 Ball Python (Harry and Fluffy and gang)
1.0.0 Angolan Python (Skywalker)
0.0.1 Green Tree Python
0.2.0 Feline (Pippen and Pandora)
0.0.1 Dessert Tortoise (Pope John Paul)
2.2.1 Fish (1,2,3,4)
0.0.0 Pool skimmer rescues for this season