Do you know any commercial rat food that does NOT have alfalfa or corn? As you may know, rats are unable to digest alfalfa and corn is not good for them. Do you know any rat food that fits what I'm describing? I can't get lab blocks, by the way, because I'm sure when I get a rat, the wouldn't want to pay shipping "just for the rat's food". Bottom line, commercial pet rat food with no corn or alfalfa of any type.