Have 3 qt tanks running and two have been at therapeutic levels for 2 weeks now. Last week I got new fish and put them in the 3rd tank which I thought had all new water. Long story short I tested the copper level today and it was 0.92ppm and has been this high since yesterday. I noticed the Atlantic blue tang kind of flashing like it had ich but it was doing it just swimming straight and not scratching on anything but other tang is doing fine. A water change was done and levels are down to .45ppm. What are the long term effects and is there anything I should look out for?


