Reading this compelled me to share a story that I never told anyone... When I had first gotten into SW tanks over a decade ago, I had a 180g tank up and running, was about 3 years established, and everything was happy and healthy. Well, I'm a "tinkerer" (read: I don't leave things alone when I should) and I started reading about Vodka Dosing. (I can hear people slapping their foreheads already)
Well, this was my lesson in ATTENTION TO DETAIL with my tank. I don't remember what the formula was that I was SUPPOSED to be using, but I somehow misread a decimal somewhere, and ended up measuring in fluid ounces instead of milliliters. The first dose was all it took. Poured in Vodka before work, I came home to find my aquarium looked so cloudy and swirly that it was like pearlescent hand soap. My swimming fish were slamming themselves into the sides of the aquarium hard enough that it killed them, and they were bleeding. The lower-level fish like my blennies and dragonets hadn't been hit by this "cloud" yet. My skimmer was gushing the foulest skimmate I have ever smelled. I grabbed a return pump, threw it in the DT, and started pumping it into my bathtub. I managed to save a lot of corals and the blennies, but I ended up flushing the entire cast of Finding Nemo. I was a horrible fish murderer, and almost gave up, but it was my wife who encouraged me to just learn from it and start again, so I did.