Pretty tuff to tell. At one time or another ive seen several species look just like that. I can tell you that it is NOT an Orino, Azul, Temensis, Pinima, Broko or Xingu. Head shape looks very Mono, but could be an Ocel. Very very very slim chance Kelberi. All three of those species look very similar at that age, though most Kelberi by that time have started to show atleast some signs of their pectoral and anal fin spangling. Hope that helps.