Hello had my yellow belly blue tang for about three weeks now. Had him in my qt tank building him up to ich. Looks like he had It. Today I just notice something else is wrong and added pimafix and melafix. Please help what's wrong and what can I do
That is a stressed out fish. You will see paling colors when they are stressed out. How long has he been in QT? Have you been checking the parameters of the QT tank? Are there places to hide, like PVC elbows?
It's pretty common practice for reefers to keep a bag of filter media in their sump in order to have some cycled media on hand in case there's a situation that requires a hospital tank. I would suggest starting that, then you don't have to keep the hospital tank running all the time, only when you need it.
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"The simplest explanation for some phenomenon is more likely to be accurate than more complicated explanations." -Occam's razor
With copper based meds and hyposalinity, this kills off any beneficial bacteria that can be presented. Water changes are the only way to keep parameters in check.
This can be easily understood with the salinity. The bacteria that keep a freshwater tank aren't the same that keep a saltwater tank cycled. A salt system goes into the realm of brackish, not really the same circus anymore...just with less bears and more elephants.
Kinda like how trials are on a different map every week Mebbid.