Interesting. Yes, I think it's a good bet that these fish are Pelmatochromis nigrofasciatus. Although stripes aren't really visible yet; the most prominent feature is the dorsal fin spot.
We did get the 75 gallon as a cichlid tank. It's all set up with caves but still cycling. These guys are currently in with the tetras but I'm afraid they're going to start eating them any day now.
15 gal: 1 butt-ton Malaysian trumpet snails.
20 gal: 20+ various molly and platy fry.
55 gal: 40 neon tetras.
75 gal: 2 Taiwan reef cichlids, 3 pelmatochromis nigrofasciatus juveniles.