Robgardner, I got three chromis about 6 months ago and they all died within a week or so. Or disappeared, all but one of them. I just got 5 and put them in my QT along with a true perc clownfish and a neon goby and they are fine but I am down to one agressive chromis. It could be that the LFS I got them from did not have quality fish, I really don't know.
Jessp, in the main tank I have a pair of pink skunk clowns and one true perc. None seem to be agressive, but now the pink skunks are in a new rose bubble anemone so maybe they will be more agressive.
I will research al of your suggestions, thank you!