have dots in the caudal fin, not stripes . G.
sp Guyana/Rio branco alos have dots in caudal finhttp://www.geophagus.de/aqua_arten_g_br ... nchus.html
The Y bar of G. dicrozoster isn't always clearly visible but you are right, only the fish on the second picture look like G. dicrozoster viewtopic.php?f=4&t=3808G. winemilleri
have only 4 oblique bar
So I don't know the species of your fish. Try to get more picture in different mood