For what it's worth, I've decided on a treatment method. I'm going to hypo the tank.
Easier in the long run than running copper. I wont have to catch my fish out either. I'm going to remove my two corals and my two cleaner shrimp plus as many of the hermit crabs and snails as I can.
While I'm bringing it down to hypo levels, I'm going to suck out my sand bed and go with a bare bottom tank. I dont even think I'd be having an ich problem right now if I didnt have sand. At least not near as bad because the ich wouldnt have a sand bottom to rest on for a couple days, it would be continually blowing around. I've read test study data on that, barebottom tanks with lots of flow didnt have the ich problems that other tanks did. Also, my ozonizer will be able to nuke the ich still if I can keep the protein skimmer running. Even if it doesnt skim well in 1.009 water, it will still have the ozone coursing through it, killing the little critters.
So I'll do hypo, remove my sand bed and put all my inverts into a seperate tank for probably 3 months. This way my rocks dont get nuked with copper. I'll be able to run carbon and the ammonia absorbing pellets, plus my protein skimmer/ozonizer combo, which I cant do if I go with the copper route. All in all, I think this will be less work and better results than removing all fish to quarantine, coppering them and letting the main tank be fallow for 2 months. This way all I have to do *extra* after the initial swap is water changes weekly on a 29g tank in a 2nd bedroom, easy.
As far as the questions fender asked... The Humu is easily the most aggressive one I have, which I too found odd as many sites list them as being pretty easygoing as far as triggers go. It actively chases the smaller pinktail, fights with the equal size Goldheart and tries to bully but fails on the slightly larger clown trigger. The clown just doesnt really care, it does it's turn and dip body posturing stuff and the humu just goes away, I've never seen it actually do anything to the clown besides threaten.
Hard to evaluate fish aggression without seeing it interact with other fish. I've heard clowns were horribly aggressive, I thought I'd take the chance with mine (was in a tank by itself) and it is a nice fish, for now. The almost half it's length and about 1/4 it's mass pinktail swims right by it, the clown from time to time looks dirty at it and it swims the other way, but the clown is quite passive. In the LFS he was actively biting at the glass and spitting water up out of the tank, following my finger around the outside and biting at it... seemed aggressive although now I think he was just hungry.
My Humu always had good color. He had been in the LFS for like 6 - 8 months before I got him, so it wasnt as if it just went through all the trauma of capture, shipping, holding, shipping and then finally to the LFS. That process makes the fish pretty weak and they dont show their best colors. After a couple weeks or even days/hours they should color back up though. For what it's worth, I feed Spectrum pellets, multiple kinds of marine meat and treat the foods with Selcon and Vitachem. I've noticed all my fish I've kept on this mix have great colors and be very active/healthy (well except this ich crap).
Anyway, hope that helps.