Hi all I've had my QT/copper bath running for about a month with a Convict Tang, Three yellow watchman goby's, Yellow Coris wrasse. In DT tank the Wrasse, Tang showed sign's of ick with flashing on rocks but all fish were health and didn't get any white spots just rubbed on rocks. The goby's were fine i guess? IE no rubbing on rocks. Now a month later everyone looks fine eating well as usual 'But tang still Rubbing on tank copper levels monitored never lower than .04 should i assume the goby's are ick free and it's only the tang and maybe the wrasse being affected?