Just to compare, here are some beani
male
female
and now some RTMs
male
female
at this stage of development the fish in question is very, young and very generic looking (at least to me) and with all the random cross breeding these days, it could end up a generic hybrid with no possibility of ever determining a posative ID.
But I believe if you post a pic a few months down the road (and if not a hybrid), a more informative ID may be possible