Hey,
Mediums are perfect for that size of a BP.
Good way to determine proper feeder size is to calculate 10 - 15 % of the BP's body weight.
At 965gram your looking at a feeder between: 96 - 145 grams. which would be a medium rat.
Here is a good size chart for reference (I have it printed off and tapped to the side of one of my racks). LOL
http://media.photobucket.com/image/r...mousesizes.jpg
cheers,
chris.
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