harlequin probs.. is it ick??

[fishwatcher]

I posted just a day or so ago on one of my harlequin rasboras acting a little out of sorts. Now one of the other ones has a white spot on his bottom lip. It's in the center and it looks about the size of a grain of salt, but not that white or hard looking. It doesn't seem to be bothering him, as he's eating and swimming fine, but it wasn't there yesterday.
stats: amm 0, nitrites 0, nitrates 5, ph 7.0, temp 78.
Any ideas? I don't think it's ick as it's not anywhere else or on anyone else, but I'm just not sure what it is or what I should do. I've added some pix... I have a crap camera... sorry!
Thanks!

 

[fishwatcher]

second picture

 

[fishwatcher]

third picture