I've done TTM before. I do have a couple more old tanks laying around so another QT is not out of the question. I'm just running out of room to keep them all, lol. What's the issue that the choati and the oreni have and how could I help them? The oreni has been in there for almost 30 days now moving him would not be the worst idea. I know I've unfortunately started his counter over again but since I plan to keep my tank fallow to clear it out, no rush or issue restarting timer on him. He is my single most expensive fish though so I would like to make sure he is kept safest. He's pretty big too... maybe 6" or so.Wow - that is a LOT of expensive fish in one small tank and the Oreni and Choates are not really good at handling treatment tanks. Here is a wild idea: the tomini is relatively low value and is acting like a "typhoid Mary" in that it is producing a lot of theronts. What about putting it through a TTM protocol? I normally do not suggest those, but in this case, it would get that fish out of the QT for a time, and might even cure it enough to put it back in the copper.
Another option would be to set up a third QT.
Jay