Sick fish....QT tanks and the headaches... how do you cope?

[Hustler]

Well my main issue that ive come across is when people say the fish should be added at the same time or they will fight.... But then say your adding too many fish at once... One by One they will fight and die... all together its too fast on the system??? ...
Ive got over 400lbs of fully cycled LR in there plus the monster skimmer and bio reactor... Its not the water...and other than the occational nipping i dont see where stress would come from?