You really should not use copper with angle fish or Tangs as it kills the bacteria in their stomachs and in general they don't make it for long after. I don't know why I read it in a article a couple months back. If it is ICK fresh water bath and feed selcon and garlic soaked food the ICK should go away. If flukes copper will not affect them much use prazi pro this will kill the flukes. One treatment in QT will get rid of them on the fish you will have to treat you DT with prazi pro, the only thing it seems to affect is Nems but they bounce back; all they seem to do in shrink up a bit. I have treated my DT for flukes once One of the first fish I got had them and they showed up about 5 days after introducing the fish into the tank. If treating the DT do the 7 day treatment. Hyper salinity treatment for ICK you have to drop salinity to 1.009 - 1.012 and can be as high as 1.015 but anything higher is kind of a wast of time as it is not a low enough salinity to kill the parasite. Also read articles on many different natural treatments for parasite eradication. Kent make a product that is suppose to be able to get rid of ICK and not Harm the reef tank it's called Rx.P or some thing like that. I have never used it, a friend has and says it works you some times have to do a second dose.

Bill