I have 2 of these in 250 bow and they love to watch TV. They are about 10 inches or so and they will both stare at the TV when it is on. They do have a large appetite and will eat anything that falls in the tank. They are very fast swimmers and have incredible bursts of speed. I have them in this tank because it has no rock and only a couple inches of fine sand in the bottom. I think that they might damage themselves in a tank with liverock the way they zoom around.