The other suspected female looks the same. Lousy photos - cellphone camera + essential tremors! The suspected male is the only one of the 3 that has the obvious odontodes; the other 2 are quite smooth.
Your "female" is not a Panaqolus!
Looks more like some kind of Chaetostoma..
So, even if it is a female, they won't breed because they're not even of the same genus..
Cheers, Sandor
P.S.: the male indeed looks like a male. Can't make out the species, but it indeed looks like some kind of Panaqolus..
"What gets us into trouble is not what we don´t know.
It´s what we know for sure that just ain´t so."
--Mark Twain
You mentioned a total of three fish. I agree with Sandor that the purported female may be Chaetostoma. But as far as I can see, the two fish in the last photo are both Panaqolus, not Chaetostoma Better photos of all three fish would help a lot.
I agree re photo quality. I think what I'm going to have to do is just get the remaining fish at the LFS and photograph them there. There's no way I can get a good photo at home if the fish doesn't cooperate - which they're not prone to do of course. At the LFS I can hold the fish and have the clerk take a photo. (I'm getting these guys free with the stipulation that if they ever breed I'll share offspring with them. I'm already their main supplier for BNs and their clients seem to be impressed by the idea they can get locally-bred fish.) Anyway, at home there's no way I can hold the fish and photograph it at the same time what with my hand tremors.