Did you ever figure out exactly what fish they were? I know this thread is a couple weeks old. But I just got 4 exactly like it that were labeled Blue Acara (Aequidens pulcher). When someone on another board said they looked like Green Terrors (who were in a different tank at the store) I disagreed with him but then got to looking at Green Terrors and they do look similar. My 4 remind me of my Eartheater (Satanoperca leucosticta) with their sloped heads and sand-sifting but they're definitely not Eartheaters, they're real personable and not shy at all. Here's the pic I posted on the other board, they look just like the one posted in this thread. That's why I was wondering if you'd ever found out what yours was, they sure look like Blue Acaras to me (unless mine were labeled wrong).