Sorry to hear about the Tang, Rev.
Basically the same thing happened to me with my Butterflyfish. I purchased him and my Naso tang together from the LFS
I go to all the time. I watched him in their tanks for almost 2 weeks every other day. I saw them both eat. They were in excellent condition when I picked them up. They lived in QT
for 4 weeks with no problems. After I introduced both of them at the same time to my 125 gal
, they got along fine with everything in the tank. 2 months later the Butterflyfish was dead. The Naso Tang is still going strong to this day. Just don't know what happened.
Rev, you are one of those kind of people that will go that extra mile to make sure you do everything right for your friends, including us humans...LOL
I doubt very much that you are to blame for any of your losses. My guess is that you are just having some bad luck with fish. Things will get better for you soon, I know it.
Like I said, I purchase my fish at least a week in advance of taking them home. If you have a good LFS
, they will "hold" that fish for at least a week for you and feed it for you so you can see it eat. This is what I do. The only times I didn't do it this way was at the very beginning, (because I didn't know any better) and just a few weeks ago when I bought the sea horses, although I saw these horse time and again over a period of 3 weeks. I just decided to buy them. Not like me. This hobby did one good thing for me, it gave me patience. Something I never had before.
Anyway, things are going to get better for you Rev, I can feel it.