Clown help

[canania]

3 wks ago I purchased 2 tr ocellaris from a lfs. They've been in a 10 gallon quarantine tank since purchase. 4 days ago I noticed the fins on one clown were getting frayed. It appeared that the other clown was beating up on this clown. I also noted one of the clowns shaking, which I read could be normal in "courtship". Hoping they would get through this phase to see who would be dominant, the submissive clown started to get weaker, wouldn't eat, the color started to fade and then died. The other clown looks great.
My question is, could the clown that died contracted brooklynella after 3 weeks in quarantine? I didn't see any lesions of anykind. I'm wondering how long I should keep the surviving clown in the quarantine and if the quarantine will need to be broken down and sterilized prior to quarantining a second fish?
Thanks in advance!

 

[Len]

It sounds like the second clown was harassed/stressed to death. This happens quite a lot in smaller tanks. It takes a larger tank and a significant period of time for two clowns to develop into a male+female pair. During this time there is a lot of aggression, so some room should be given for the submissive specimen to hide. If both your clowns were small and roughly the same size, it means they are both juveniles and males. The dominant specimen will become the female of the two, undergoing sex change. To gain dominance, it will harass and nip the other clown; this may lead to death by physical injury or chronic stress. I think this probably happened to your clown.