I've read they can be murderous among conspecifics, so I'll be keeping a close eye on him just in case he doesn't know they aren't family.
Wow. Comparing pics, he really colored up a lot. I've just been calling him "Old Man" since Baron Von Fuzzywhiskers is hard to remember on a moment's notice.
Only now is it clear how thin he was. I'll bet he'll soon balloon up like the raphs.