12 days is a pretty good run. You're almost out of the danger zone from a timetable perspective. (I hope I'm not jinxing this by saying it!!!!!)
The mouth sounds normal. All the ones I've ever seen have had that little purple thing. It's kinda cool isn't it?
I can't remember but I don't think haddoni's have it at all (or at least, not all do), so that also is a sort of a "distinguishing feature."
I feed mine mysis (although really they eat anything I offer - flake food, cyclops-eeze of all things - you'd think it would be too small - but no they seem to have a vigourous feeding response to it).
I anxiously await a new picture