I don't quarantine. The things that have cause me so much greif, couldn't have been caught in quarantine. Ick is ick, I have never had it spread, and I always feed Garlic soaked food for new fish. As far as corals go, I only have a few pieces of SPS so I am not going to be detroyed if they die. Never had a softie get sick. My main issue has been bryopsis, and I didn't even know what it was when I introduces it to my tank.
I will probably learn a hard lesson some day, but I think fish get stressed easier if they are in a small tank, and other than my 125, I only have 30's. I also think that 2 acclimations are worse than one. This is also a stressful event.
I almost lost my bluethroat trigger to acclimation, andI don't think he would have survived another one a week later.
...just an uneducated opinion
30L w/10gallon sump 4xt5ho; Up and running:125g long, 30g sump, 50g fuge.
"Life is tough, but it's tougher when you're stupid.”
John Wayne