Awesome. Thanks. I will definitely check some of those out.
One more question, if you feel like it:
How can I control the ammonia in the QT tank? I used copper to treat the ich. I see the hyposalinity is the preferred treatment, but (clearly) I am in the learning-from-my-mistakes phase here. As I understand it, the copper kills the bacteria that eliminate the ammonia, which means that ammonia builds up pretty quickly. Can I just keep treating with something like Cycle? That's what I have been doing so far, along with fairly frequent water changes. Unfortunately, water changes will screw up the amount of copper in the QT, which sort of defeats the purpose in this case, no? I feel like I'm almost certainly not doing this right.
I suspect that this is covered in some of the links above, but I'm not through all of that yet. If you can skip me ahead to the punch line, I'd sure appreciate it.