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Welcome to C-F

What you are experiencing is typical behavior for Malawian fish. The 2 fish pictured are both hybrids that were engineered in a lab, of sorts. They are not true Aulonocara, and notorious for being aggressive. Probably a good fit with your mbuna(depending on species).

When adding a lone fish to existing fish, you most definitely will have issues. All attention will be directed towards the newcomer. This goes for species with a reputation for being timid, as well. Not just aggressive species.

Not many options for you.
Return the OB
Give the aggressor a 'timeout' (often does not work)
Rearrange the entire tank decor/decorations

What you don't want is the bullied fish becoming so stressed that it comes down with an illness, which can affect your entire stock.
 
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