Clowns are territorial and can be even more territorial/aggressive when paired up. I think they just don't want anyone other then themselves in the tank. But on the long run, different clowns are different (some picks on new dwellers and eventually calm down while some will keep on harassing till death).
And about the starfish, they will not die even if they are exposed to the air for a long time. That's just a myth used by many people that stars die if exposed to the air even for a bit.
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