lol
im sorry im reading this laughing... not at the fish dieing, but the reply's.
1.5yrs on a fish's life, is nothing to brag about... 15 years is 20 years. look at paul, he's had some fish for almost 30 years. With out detailed info on the system. perameters of the water it left, and the water it enterd, were all pissing in the wind.
the point of a Qt, is simply to stop unwanted things entering your confined system.
a single fish, or anything wet from anther system has the potential to have meny different types of bacteria or pathogens. Some will effect fish others will effect coarl.
Have a tank for 2 years isnt saying much.. the name of the game is zero death. not "i have money and can/feel alright buying fish to replace fish"
your success with reefing is based, on the longevity of your inhabitants, Think of them as your Dog.
going back to the dead wrasse.... damn im sorry to hear this... 5 days eh? did he eat? did you feed him? did you notice anything in your tank change?
on the other note, when you add a single fish 2 a system, large or small... there are immediate and long term changes that are going to acure
hypothetical speaking the wrasse, had something on it.. a bacteria infection of the gills, you couldn't see when u got it.... the fish was introduced 2 a system.. that was more favorably for this bacteria to grow.... and less favorably for the fish 2 live.
so the bacteria had its way killing its host and being released in 2 your system after death. now putting the rest of your fish at risk....
qt is protection, not useless
sooner or later people always come 2 understand why a QT is importent