Yes, I completely agree with you. I actually go one step further and typically suggest that people don't quarantine sand-sleeping wrasses. I know that is playing with fire but they really do need a proper sand bed and they are typically quite sensitive to medications anyways. Oh, and these fish are very sensitive to light cycles and can actually be jet-lagged. A stressed out, sleep deprived, med sensitive fish in QT isn't going to last very long.
The first two times I tried Potter's wrasses I QT'd (with sand) but the smallish tank and sub-optimal sand bed stressed them out. One didn't make it through QT, the other made it to the display but was in bad shape by the time it got there and didn't pull through. The third time, the wrasse was slightly worse for wear from shipping but I said "screw this QT thing" and the fish went into the display right away. For the next two months I was slightly stressed I'd wake up to a velvet outbreak or something nasty, but nothing happened (I learned from a biologist later on that these fish tend to be less prone to external parasites due to sleeping in the sand and a thick mucus coat and suffer more from internal parasites). Buried itself right away and was out the next day looking pretty mellow and picking at the rocks (a good sign). Within a week I had the wrasse go from live brine to cyclopeez and then frozen mysis - a feat I hadn't been able to achieve with the other wrasses which wouldn't eat at all. Had it for over two years before it got chased out of the tank by my coral beauty 3 weeks ago, and he was doing great until then (he was one chubby mofo) - this far exceeds the sub-1 year average you typically hear for these fish.
And I attribute it to having a good start by keeping the fish stress-free by giving it what it needed...
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