There are too many factors that could be at play, and I don't think that calling out the LFS or blaming them should be the point.
Most livestock these days are sourced, collected, and distributed through very similar channels, if not the identical ones.
I never buy a fish that just came in on the first day, no matter how much I want it, or how good the price is.
I always ask, how long has the fish been in the store? Is it eating? Where did it come from? What is the current salinity is it in?
II buy my fish from select stores and I can tell you that I know what salinity they keep their tanks (Ranges from 1.015 to 1.018). And I also double check salinity level when I get home by testing with a salinity pinpoint monitor.
MOST IMPORTANTLY:
It is my strong opinion that there is NO SAFE WAY to drip acclimate a fish from 1.015 to 1.025. Doing so could only lead to harmful or disastrous outcomes.
As such I QT every fish. And my QT when ready for new fish (from LFS) is always at 1.012.
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