I just have one BP...he's about 6 months old. He's been on small adult rats for about a month now....feeding every 5-ish days. Just last week, I ordered a pack of 15 small adult rats from Loxahatchee. The price was overall cheaper per rat that Petsmart and MUCH better quality. Honestly, I think our BP will be able to eat bigger rats before the 15 are used up....but I'm gonna see how he does. I'll be very surprised if we have to order small adult rats again....I'm thinking the next size up, at least after he polishes off this pack of 15. - now its 14, he just ate.With that said...I'm VERY happy w/ Loxahatchee. Their rats are clean and neatly packed, and very easy to separate to thaw.