Alex.P;856309; said:I think the one i though was a Falkeri is a Potamotrygon Signata P41. If you have the Aqualog on freshwater stingrays Richard Ross book (the holy grail of ray books) look at
pg 123 the pic in the top right looks like your ray. and on Pg147 on the bottom left there is P.Signata P41 that also looks like your ray.
Whatever they are they are great looking fish, i wish you all the best with them, and hope they breed soon.