Yes, kept her solitary in a 150g (6x2x2) until almost 24" purely because she would tear anything else to pieces, including my hand. Although had to move her to the pond at that size, age around 4 yrs. But I would suggest due to her solitary behaviour, her willingness to interact with me , (even though it was aggressive) and her quite sedentary and basic requirements ( in catfish terms) she would be about the biggest thing suitable for a 240g, although there are other similar options (although sometimes harder to pick up).