I wouldn't stay on 5 or 6 days with small rats ... If you do, what will eventually happen (2 or so months into it) he will most likely go on a fast because he has had to much to often, while this doesn't always happen, the majority of the time it does. And that is going to leave you with a lot of wasted money on feeders that do not get eaten. As Slim said, I would go with a 7 day schedule when you bump up to smalls .... Plus, why not?? It will be a lot easier to remember when to feed because it will be the same day every week