I don't think so, it looks like the fish left are doing fine. I add the second dose of meds tomorrow, so we'll see how they look.

So this means you've had no more deaths? That would be great.
There's been so much x-tra chatter in this thread that I haven't been keeping up.

lol :) Ya, the fish remaining seem to be good, they're eating and playing and doing fish stuff. The yellow tang seems a bit off food still, but no more bumps or dots or powdery skin.

Do you think a UV or Ozone on the main tank would help during the fallow period?

Cheers,
Vic

Excellent.
And for the chatter, I tried to read it all, and it's good reading.
But sometimes ya get too busy and have to skim the content.

I don't see it hurting as far as 'bad critters' goes, but it will also kill off good bacteria. And especially since they aren't multiplying as much when it's fallow, my thought is, unless you are in a hurry, it may cause some unwanted die off.
Wouldn't most bad critters die off eventually on their own?

They will, but there also isn't any appreciable amount of good bacteria in the water column to worry about. Not really in a rush, other than getting the remaining goby out...

I don't remember where I originally learned about copper toxicity because it was probably a decade or more ago, but a quick Google search comes up with an article in a medical journal:

Copper and Alzheimer's. [Paper]

Copper toxicity in Merck Medical Journal. [Article]

Liver cirrhosis from copper is rather unusual to typical healthy people because the liver is able to remove copper via bile. People with a genetic inability to remove copper from their systems (like Wilson`s disease) will get accumulated copper in the liver which will lead to cirrhosis.

I think I missed something during my plumbing ...
Did Brad say he lost ALL his fish ?

Well that was a stupid post that I now can't edit.
I see, reading above, that you have remaining fish Brad.
I obviously confused your dilemma with someone else's.
I hope the dudes you have are doing well and fully recover.
I'm going to go back to my plumbing now before I make a bigger ass of myself that I can't edit later.