what about the difference in salinity from LFS and your tank? that doesnt cause any issues when not drip acclimating?
I too am shocked you don't QT lol.. my LFS owner is against QT also.. interesting.. more stress in QT environment he says.. but I like to observe without treatment for 2-3 wks just to be safe
That a great question and consideration if your DT is a reef. If your tank is 1.026 and most fish are transported/kept at 1.019 ish, this will cause some respiratory stress. It generally looks like the fish gets lathargic and stays quiet. Sometimes they recover, some say not. But likley days.......
So I first check the bag salinity then float the bag. I adjust the water in the bag for both salinity and temp, but just over an hour. Since I have done this fish go in the DT and are swimming around normally almost instantly.
In addition, snails do poorly when salinity is not matched, same with stars and clams.
I do QT where it makes sense, but only for a period that makes sense.
I only medicate if there is a need.
I did not QT the pod eaters cause they would starve.
I did not QT the sand sifters for the same reason.
I do QT tangs always as they are prone to Ick. But I don't QT for 30, 1 week, at 1.019, then a daily upgrade of .002 for the the second week up to DT salinity and then drop.
Just dropped a yellow and blue in 2 weeks ago and I am amazed, both went instantly to swimming/grazing mode.
Corals, no QT, but dipped, brushed and inspected
Nem, again just salinity and temp
I think each stress you remove leads to better success.