12-31-2011, 07:18 PM
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Not surprising, that.
Both are cichlids, the latter is as you correctly identified a Melanochromis johannii, and the first is Hemichromis bimaculatus, commonly called the Jewel Cichlid. This one is in our profiles, click the shaded name for info.
Both are aggressive fish. The blue is a rift lake cichlid, that should only be kept with other rift lake fish in largish tanks. We have some cichlid experts here who can add to this generality.
The Jewel should be in a 4-foot tank (it attains 6 inches), with medium sized fish as noted in the profile.