Hi- I've kept leopard ctenopomas for years- they will eat your shrimp, eventually. I guess they must be pretty small right now. Mine have had slightly different personalities; the first one(lived 10 years) while it would eat anything and everything that fit in it's mouth, it was fairly peaceful. My latest is pretty territorial and often flares up and threatens my gold severum, which is around the same size currently, about 2-3 inches diameter. They get decent size, so a 15 might end up being too small for an adult, but it should be fine for a while. I have kept them with much larger semi-aggressive fish such as severums, polypterus, geophagus, etc, and they do fine. I'm sure you could keep it with any decent size gourami or angelfish, anything that is not small enough to be eaten, and not extremely aggressive.
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