Hey all I’m new to the forum and the hobby! I’m frustrated which I expected could happen, to be quick I went out purchased a 55gal corner tank filters, live sand , live rock all in all including livestock about $3500 in so far. Things were going great I met a lfs guy that seems very knowledgeable and purchased 3 beautiful fish from him. A few days later at another lfs I purchased a powder blue tang took him home and put him in the display tank. Fast forward 3/4 days and I see the white spots on him , I call the first lfs guy and he tells me I need to treat the tank with coppersafe for a month. I went out purchased a qt set up caught my 6 fish (with the exception of 2 damsels and a spotted gobby that are just 2 fast to net) and dosed my main tank as well treated my quarantine tank. 2 days later I lost 3 fish in qt to include the tang that “started” the problem. I have been reading up on coppersafe and see a bunch of mixed reviews. My question is should I replace all of my live rock in my display tank and over the next month do a 100% water change and just start over I feel super defeated but don’t wanna give up