I think there was a few factors here. I didnt have a QT tank started from the beginning, so it was a thrown together QT. I did use as much water as possible from my DT, but all the same. I dont think water got above 1.010 or 1.011. It is a 45 gallon tank that had 2 tangs and several other fish as well. One of the tangs who brought on the ich was pretty infected. I also should have been better about keeping up with water params. I'm not sure how accurate my test kits were. Sometimes the reading didnt seem quite right for what was going on in the tank. My ph barely changed with adding the lower salinity water. That seems strange to me. Ammonia was slight from the beginning, that also never changed, so I dont know if my test kits were faulty of what, but anyway......... I still have 3 fish left. I am still raising SG. Havent seen a spot on them, havent started the copper yet either. I really think the long term hypo killed my tangs. I kept them in way to long and their immune systems couldnt take the ich that attached. Thats my guess anyway. In February I will get some new fish and try again. This time hopefully smarter and wiser. One good thing comes of all this, I have a QT setup and I will never put a fish into my DT again without QT'ing it!
