Well I sold my 6 rbp's so I could buy a fahaka puffer. They were shy yet piranhas like dimly lit tanks. I have had my puffer for about a month and I must say it is one unique fish very intelligent and a one fish one tank species. I say your best bet would be to spend a hour or two on YouTube searching the various different species you are pondering. If you want a fish that's happy to see you come into the room and has it's own mind pretty much any puffer is the way to go.
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