Did you QT the fish first? It's possible the fish was sick when you got it and died from that rather than the sickness of the fish. However, due to the size of the tank, there's nothing there that's not in their territory. I have to sentence my clowns to the refugium for a few weeks whenever I add new smaller fish and that's in a 90g tank.
Originally Posted by Bectan01
I have been in this situation before. I stopped adding fish because none of them would survive. In a 29g you would be hard pressed to find a more aggressive fish but perhaps a damsel could work? They are mean too
Sent from my iPhone using Aquarium Advice
That would just be throwing fuel on the fire. The clowns are showing their dominance to any new fish added. It stops when they are satisfied it's still their territory. With a damsel there won't be any decrease in aggression since they are soo closely related to clowns.