Thats a shame Maik,
As regards temperature I have heard/read that lowering it is better. Apparently the parasites prefer the warmer temps to the lower. I have no personal experience of this though.
Hyposalinity treatments are less harsh to the fish, lowering it to 1.009 over a week or so would be better than copper treatments, obviously you would still need to get the fish out.
UV will help kill the free swimming stage of the parasite. After it has hosted the fish for a few days it will become free swimming for a few hours. Then they will reproduce and turn into further free swimming stages searching for more fish to infect.
HTH, best of luck with it!
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