OK, so, e-goby looked awesome for a week. The stuff I saw at first really was sand, and not ich, it later turned out.
My flame angel was starting to show stress coloration in QT despite decent parameters (0.25 ammonia but that's the only concerning number), so I decided to move her, too.
When I got her under the lights in my DT I saw that her entire face is pale and excoriated, like she'd been rubbing it on the airstone in QT or something. Within a few hours, my e-goby was showing ich symptoms again.
I'm not sure if the flame angel is still carrying ich, or was stressed by the copper, or both, or whether the relapse of the goby is a coincidence or not. The whole thing also coincides with 6 weeks since initial infection, which matches the lifecycle of the ich parasite (3 weeks), so... there's a lot of variables.
I came to think of the damsel I couldn't catch as my canary in a coal mine, but obviously he's just resistant to ich and is no indication of safety whatsoever. Now I have to recapture everybody again (ugh) and get them all into QT including that very difficult to catch damsel.
After doing a lot of reading about Paraguard it seems it's 50/50 in terms of opinion on whether it's safe in a reef tank. Getting frustrated and not wanting to get all of my livestock out of the tank again, I decided to try a half dose and see if my softies tolerated the stuff.
Nope, everything shriveled up within an hour. I've got my skimmer skimming wet and hopefully the corals will recover. The shrimp, crabs, snails, and nems look fine. I won't try that again. Paraguard: NOT safe in the DT, just don't do it.
Now my only outstanding concern is the flame angel who clearly was doing very poorly in QT (the other fish all recovered very nicely in there.) Cupramine is supposed to be safe for flame angels, but maybe not for the duration (5 weeks) I had her in there? I'm pretty well resigned to the fact that I'm going to lose the angel.
