If you know for sure that it is a male then the size you posted is perfect. Males do not get very big as a rule. Feeding once a week is fine as long as he is getting the proper sized food item.

As for your other question about adding a cage mate: as a rule of thumb you should only ever add animals which you expect to be prey items in with any reptile (ex. guppies with sliders, frogs with eastern hognoses, etc.). Most reptiles, and esspecially snakes, are not social by nature. You can't add another snake and expect that the parties involved will be happy about it. More likely they will feel threatened and stressed and eventually one could end up eating the other, whether its hungry or not. It is very tempting to keep more than one animal together for our own selfish pleasure but it's really not in the best interest of the animal, and thats what we have to keep in mind. Hope this helps.
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2.1 dogs
0.1 cat
1.2.2 crested geckos ( 6 eggs)
1.2 leopard geckos
0.0.2 Western Hogs

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