Marble, beautiful fish they get real big.
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Just my thoughts but I wouldn't risk a blue aro with a lungfish. I kept a silver and a lung together in a 150 for a year and around 12" or so the lung started stalking the aro trying to nip him from underneath. I put in a divider and bought my 300 for the aro. The lung is super aggressive now he attacks the gravel vac and snaps when you walk by.
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I've kept every species of lungfish. My experiences showed me that no species of african LF can be trusted in any sort of comm setup. Every one of my africans has attacked/eaten its tankmates. The only species I've had success in a comm are Lepidosiren paradoxus (South American) and Neoceratodus forsteri (Australian).