Good thread, stumbled on it as I am recovering from my own meltdown and figured I'd add to the misery and revive the thread.
In my haste to get my upgrade done on a new custom 125g tank, I decided I couldn't wait to order PVC gate valves so I installed brass and learned the hard way that brass doesn't really mean pure brass. By the time I figured out that it contains copper, I lost almost everything including three Florida ricordea colonies, three beautiful Yuma colonies, all of my good zoa colonies, 10 headed torch, all my inverts, chili coral and my suncoral. Thankfully my one favorite piece, my huge frogspawn survived and is the centerpiece of my new start.
Hopefully someone else can learn from my mistakes. Patience is the most important ingredient to success in this hobby. It is usually the biggest contributor to many of the failures I've seen.