I have kept all 3 species, and just as I couldn't decide on just one species to keep, (and didn't vote), I personally gave each pair a 6 ft tank.
Although none of these species are anthropomorphically dog like, such as oscars can be, so in that sense "not"normally wet pettish.
If you want that kind of response, put one fish in the tank, where you become it's only outside stimuli, and a relationship can transcend species.
If you have any other fish in the tank, wet pettishness probably won't happen.
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