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It's for sure not D50. My guess would be some hoignei-subcomplex species too. However, the exact species will be almost imposssible to tell without knowing the catch location.
I think you have two males. The caudal patch of the smaller one looks more like that to be expected from A. cf. ortegai (Pebas) to me. However, the general problem with ortegai-subcomplex species is that there are many mixed forms (=hybrids) in the hobby (even wild caught specimens due to...
It's a possible explanation but seen in many line bred strains (also of other species like cacatuoides or macmasteri). Poor water quality can also be a cause of shorter fins.
The patterning on the scales in fact points to one of the Netz-forms. But unlike this fish, the Netz-forms usually develop quite long tips on the dorsal, anal and caudal fins. However, there can be quite some reasons why this isn't the case here, in particular if these fish are tank bred.
Back then I suggested this name for the species also known as A. sp. D12 because the caudal spot of one of the first specimens I saw reminded me of pac-man:
Without clearly seeing the caudal pattern it's impossible to tell anything other than that it's one of the uaupesi-like species - A. flabellicauda is one of the possibilities. However, even when knowing the caudal pattern, it's impossible to be 100% sure because the uaupesi-related species are...