Mystery Deaths!

I highkly doubt a BTA woulf kill of the fish....wy too sudden to be from any infections or internal disorders imo. I would lean toward accute poisioning....blue chromis keel over very very easily and often dye soon after they are aquried because they cant cope with the fast distributors perform prior to shipping. PJ;'s and especially chromis are pretty shy, just about the opposite of the marron clown and definatley of the damsle. Poisioning or stress...? All i can think of if the parameters are good.