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Rocio octofasciata
Mostly black with yellow flecks all over
That Pet Place, Lancaster, PA
This is not a plescostomus, which is a type of catfish! The fish above is a type of cichlid. Double check your ID http://www.planetcatfish.com/common/spec... is clearly not the fish above.
The Jack dempsey is a common pet store fish http://en.wikipedia.org/wiki/Jack_Dempse... - although I'm not 100% certain that's what yours is, it is certainly related to the Dempsey