My Niger has been a model citizen. Was a bit of a tank bully initially, but then my blue tang took the reigns and he is very submissive now. Tried to add a Huma to the tank with the Niger, but the Niger was trying to literally kill him within minutes of discovering him in the tank. The Huma also, before being discovered by the Niger, went straight for my hermits and snails as soon as he was released into the tank.