foxface acclimation

I recently had a small foxface killed via powerhead in my reef after 6 long weeks in qt. While in qt the fish showed no signs of illness or disease.

I purchased a slightly larger foxface lo from the same LFS who was alert and active, took the fish home acclimated him to ph-adjusted water and freshwater dipped him using a little bit of melafix and added him directly to my reef.

I usually qt everything, but was a little frustrated because of the death and took into account the dependibility of quality of the fish i purchased from my LFS (no problems or deaths), the freshwater dip, low stocking, low aggresion tank, and Robert Fenner belief in risk of damage to this particular species during transport and retrasport. (wetwebmedia.com's forum on rabbitfish).

I guess I am seeking info on the dumbness of this act. Any foxface owner here do the same thing. I am sweating bullets because I went against my qt all fish belief. I hope the fish gods are looking down on me with mercy. Hopefully the fish will eat today.