well the two bigger ones i got from the lfs so i assume they are monos.. and the two smaller ones i bought from a member (BigPleco) here and im takin his word that they are orinos from the rio tomo i think? great fish great personality. they have a more gold yellow tint right now more so than the monos. i guess at this stage they are hard to tell the difference, still young around 4". thanks for all the compliments