my ball is around 7-8 months at the moment and is 'just' switching over to smaller rats .. problem is the store i buy his food from doesnt always have the correct size rats (usually to big) so i was thinking of just giving him 2 full size mice for a few months (ends up being the same price)

now my question is whats the best way to go about this? let him eat one then wait till its all the way down then toss the second one in?

or should i wait an hour or so then toss the second mouse in?

thanx in advanced
-any tips are always appreciated