3month old spider ball to gain size, and put her well on her way to breeding??

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Originally Posted by LotsaBalls

I would recommend offering rats of appropriate size and feeding one every five days. They can eat more and some will eat twice that but a steady feeder is better than one that eats a lot then is off feed for three weeks.

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exactly how can i ensure im offering the right rats??
as of now she is eating the mice from petco with no problem at all