When is a good time to introduce a CK with a silver aro? I currently have an aro thats about 5-6 inches long and a CK thats about 7 inches. I know that the CK is way bigger in general than the aro. The last time I tried to introduce them to each other the CK started to mess with the arrow. I just saw him try to nip him a little so I put them into seperate tanks. Anyhow, any help will do. At what sizes, different strategies, etc.