Ill take a stab at this. First off, you might have issues with rtbs giong after the leps becuase of similar torpedo body shape and that will definately cause problems between them. As juveniles these guys are mildly passive and don't cause to much of a stir. They can be hit or miss but ss they mature they can really turn out to be KILLERS. That said, I think these fish would best be kept with pretty aggresive fish singly, or in a species tank. Just keep an eye on them because I think they can and will hold their own. They get relatively large, (about a foot) normally, as I have seen MANY returns to the fish store after they outgrew a 55 and were a foot long and 3 inches wide. There are also two separate species, and one is mainly vegitarian and the other being an omnivore. I think the difference betwen the two is 10 stripes versus nine stripes but I don't have time to look it up right now. Interesting oddball fish I would recomend keeping. Well worth the risk if you have the room.