Why does he have a scaled tail now?

SomeInternetGuy said:
Why does he have a scaled tail now?

Hades cursed him as some sort of punishment for barging into the underworld for stupid reasons. The river Styx is not supposed to be used as a revolving door. A bit like how Apollo gave king Midas donkey ears xD

I have a feeling, that for him having that tail isn't much of a curse.

I also feel he'll probably do it again anyway. Wonder what type of other "curses" hades might try and pull.