Well, it's kinda hard to see what he is if he's not flaring, but he might be a HM. To me, he seems a bit bloated, but you might want a second opinion about this. I'm sure his tail will grow longer as he ages. The transparency at the end might mean that it's new growth, or it's the coloring of your boy.
He was a little bloated when i took that shot, had just introduced the glass shrimp, didn't realise he would go quite as nuts on the little ones as he did. :) If the larger females with eggs drop fry he'll be like a pig in mud!
He is quite young, as he's tiny, so clear means new growth....did not know that. he is super active and no damage to the fins... just transparent.