That is a tough one, isnt it. The things swaying me towards boy (and why I gave him to Stan, cause he wanted a boy) was that he had a very pink comb at 4 weeks, and for what its worth, all the girl splashes that Ive hatched have ended up with hardly any black at all on them, and Stan's has a...
I dunnoo.....heres my very first blue boy at the same age as yours:
and fully mature....
So you may be right, it might be a girl...but I have my doubts...