Greetings and a question regarding deaths while adding new fish.

[ReefDruid]

Thanks again for replying.

The first and second clowns I purchased had both been at the LFS for some time (according to the proprietor), on the order of more than a month. The pygmy angel apparently had also been around for some time. The third clown was new to the tank, only having arrived a couple days before.

As for aggression, the female clown is amazingly gentle. In fact the most gentle thing in the tank besides the snails. No aggression observed, and I have been steadily observing. Also, the third clown was added to the 40B with only the bi-colour blenny.

Is it possible that extreme stress could have caused these conditions? I mean I know anything is possible, but does it often result in a fatality?