Parachromis multifasciatus and Amatitlania nigrofasciata native ranges do NOT overlap.
There are feral populations of nigrofasciata in the Rio Amacuzac in Mexico, but P. Multifasciatus is not found here.
You do not mention tank size/ ultimate tank size the fish will be in once older, which would help with suggestions for dithers/ other fish.
I personally have kept P. multifasciatus with Cryptoheros spilurus and Petenia splendida (as well as a few other species) The multifasciatus never even attempted to eat the smaller spilurus and only cared about each other (provided the other fish weren’t small enough to eat).
I’d suggest either getting more specimens, or waiting for the fish to settle in more. 2 weeks is not a long time for a fish of that size to settle in and feel comfortable.
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