Sorry i just saw this thread. IMO honestly your guy looks prolly double what my bp is and mine is downing Weaned Rats which is one step up then a rat pup... He is a picture of mine so you can kinda see the difference.. Im gonna start offering two weaned rats just cause i have a lot of them from ordering two many lol... but yea go with a weaned that pic looks like it can handle it no problem.
I have seen guys on here feed there 300g a small rat and they say they do fine...
Mine is about 200g so a weaned possibly two weaned is perfect until bigger
this gal is only 210 grams top right