Love the Potamotrygon sp. "Red".. I believe it's actually the TRUE reticulata..
When the 'Teacup' reticulata we have been seeing in mass numbers out of colombia with the close of the brazilian ray export, is actually P. Megdelanae. They are very similiar when young, and they are synonymous with each other, both being labeled 'reticulated ray'.. However, P. Megdelanae loses it's vibrant pattern when it gets larger, and it washes out.. One of the distinguishing characteristics between the two is their pattern when they get larger, and the markings on the underside of the ray.
Someone should snatch up that P. sp "Red" because you don't see that variety very often at all, and that is 'adult' sized, and could probably produce pups at that size.
Good Luck with the sale!! Awesome specimens..