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I think this is excellent advice. This is very similar to how scientists build immunity to fish to be used in studies. They expose the fish to a parasite and then use medicines to eradicate the parasite before it can do lasting harm to the fish. Typically it takes 2 exposures and treatments and the fish fights off the 3rd exposure on its own.You could always try the theoretical “reverse QT”. Treat him, get him fat and healthy again... feed a variety of algae and live, quality frozen foods enriched with vitamins/ selcon, etc.
Once you feel like he is completely recovered from the treatment... spike the QT. Add a piece of sacrificial live rock from your main tank, sump, etc. a clump of chaeto... whatever you have that might bring a hitchhiker over.
See what happens. If you see a spot or two, vacuum the tank bottom and do a water change every few days to keep the populations under control while continuing to feed heavily. Wait some more and just see if he can overcome it on his own.
I did, but everything is so theoretical at this point. I started that as a way to gather information, not necessarily to be used yet.@Brew12 recently posted a thread that discusses some of the things that could factor in for successful disease management without QT meds... if you haven't seen that one yet.
I would go that route, but how the heck do you catch 5 firefish that can’t be baited into a trap?
Copper only affects the free swimming variety but it does so very quickly. The parasite can stay on the fish, protected from pretty much any treatment, for up to 7 days. It then drops off and encysts on a hard surface. A few days to a few weeks later it hatches releasing the next generation which are again vulnerable to copper.How quickly does copper kill ich? What if I put the gem back in the display after a FW dip and day or two in copper and see how he manages? It's so strange none of my other fish have any signs of anything.
I might order the 40W UV. I need to do a bunch of reading first though, not convinced it's the answer.
But I suppose if I introduce ich into the quarantine after 30 days (or 14 days maybe) and he becomes infested with it again I need to start over and quarantine again for 30 days?
I feel terrible seeing that poor fish stuck in a glass box full of PVC. I guess better that then dead though.
An update on this. I put the gem in copper for a little over a week then back in the display. The gem has been clean since going back in.
I ordered a Reefer 750 XXL this week and plan to move my rock and coral into it and run the fallow period before adding the fish. I'll run them in copper and TTM before going in the new display.

