Ok, I need some help making an artist tag. The artist's name is Callan, Callancoe or Callanco, not sure which one should be used

http://www.pixiv.net/member.php?id=13715434
https://twitter.com/callancoe
http://callanco.tumblr.com/

Same artist than
post #1979620
post #1979621
post #1979619

I would have suggest to put "callan_(callancoe)"
(pixiv id_(twitter id))

But I think it's better to ask here first:
http://danbooru.donmai.us/forum_topics/8199?page=128