I had a major event where I lost half of my fish. At first everyone thought that it must be Velvet, but I believe it was a bacterial bloom caused by a few changes I made.
1. Stopped GAC and
2. Stocked the tank fairly full and
3. Dosed for 3 weeks straight Coral Vitalizer and Pohl's Xtra. For the amount of corals I had in the tank, this was way too much. Algae bloomed which was a warning to me, that I ignored. Then fish started dying for no apparent reason.
Immediately I did water changes, started GAC and stopped the additives and turned down the lights. Half the fish died within 3-4 days. My powder blue tang died first followed by 7 chromis, 2 clowns and a couple of gobies.
4 of the 5 tangs lived, the wrasse, lawmower goby, and 5 chromis lived.
All fish are now doing better than ever.
The additives did help the corals grow and color up. I stopped using the additives for the last 3 weeks and corals still look great. I will dose only once a week instead of 7 days a week.
Here are some photos of some of the corals (from a Iphone)
