i was wondering what ppm should i keep my QT? i using coppersafe by Mardel and i'm quarantining a blue tang, flame angel and a wrasse in a 20 gal tank because of ich. I will leave them in the QT for eight weeks so my display tank can have the ich die off. my LFS said to maintain the copper level and 2ppm. is that ok??? don't want to kill my fishes. thanks